169155351225 has 81 divisors (see below), whose sum is σ = 352531503597. Its totient is φ = 77308418880.

The previous prime is 169155351217. The next prime is 169155351257. The reversal of 169155351225 is 522153551961.

The square root of 169155351225 is 411285.

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

169155351225 is a `hidden beast` number, since 1 + 6 + 91 + 5 + 535 + 1 + 2 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6178431609 + 162976919616 = 78603^2 + 403704^2 .

It is not a de Polignac number, because 169155351225 - 2³ = 169155351217 is a prime.

It is a super-2 number, since 2×169155351225² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 43182967 + ... + 43186883.

Almost surely, 2^169155351225 is an apocalyptic number.

169155351225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

169155351225 is the 411285-th square number.

169155351225 is the 205643-rd centered octagonal number.

It is an amenable number.

169155351225 is an abundant number, since it is smaller than the sum of its proper divisors (183376152372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169155351225 is an frugal number, since it uses more digits than its factorization.

169155351225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7864 (or 3932 counting only the distinct ones).

The product of its digits is 405000, while the sum is 45.

The spelling of 169155351225 in words is "one hundred sixty-nine billion, one hundred fifty-five million, three hundred fifty-one thousand, two hundred twenty-five".