169987488305625 has 45 divisors (see below), whose sum is σ = 306825403889433. Its totient is φ = 90659472246000.

The previous prime is 169987488305623. The next prime is 169987488305647. The reversal of 169987488305625 is 526503884789961.

The square root of 169987488305625 is 13037925.

It is a perfect power (a square), and thus also a powerful number.

169987488305625 is a `hidden beast` number, since 1 + 6 + 9 + 9 + 8 + 7 + 48 + 8 + 3 + 0 + 562 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13327019083161 + 156660469222464 = 3650619^2 + 12516408^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 169987488305625 - 2¹ = 169987488305623 is a prime.

It is a super-2 number, since 2×169987488305625² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (169987488305623) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 977757456 + ... + 977931294.

It is a 1-persistent number, because it is pandigital, but 2⋅169987488305625 = 339974976611250 is not.

Almost surely, 2^{169987488305625} is an apocalyptic number.

169987488305625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

169987488305625 is the 13037925-th square number.

169987488305625 is the 6518963-rd centered octagonal number.

It is an amenable number.

169987488305625 is a deficient number, since it is larger than the sum of its proper divisors (136837915583808).

169987488305625 is an frugal number, since it uses more digits than its factorization.

169987488305625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347704 (or 173847 counting only the distinct ones).

The product of its (nonzero) digits is 6270566400, while the sum is 81.

The spelling of 169987488305625 in words is "one hundred sixty-nine trillion, nine hundred eighty-seven billion, four hundred eighty-eight million, three hundred five thousand, six hundred twenty-five".