1660580163225 has 27 divisors (see below), whose sum is σ = 2974318202973. Its totient is φ = 885632444640.

The previous prime is 1660580163149. The next prime is 1660580163227. The reversal of 1660580163225 is 5223610850661.

The square root of 1660580163225 is 1288635.

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

1660580163225 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 5 + 8 + 0 + 1 + 632 + 2 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 320560924761 + 1340019238464 = 566181^2 + 1157592^2 .

It is not a de Polignac number, because 1660580163225 - 2²⁵ = 1660546608793 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1660580163227) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19286571 + ... + 19372479.

Almost surely, 2^{1660580163225} is an apocalyptic number.

1660580163225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1660580163225 is the 1288635-th square number.

1660580163225 is the 644318-th centered octagonal number.

It is an amenable number.

1660580163225 is a deficient number, since it is larger than the sum of its proper divisors (1313738039748).

1660580163225 is an frugal number, since it uses more digits than its factorization.

1660580163225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171834 (or 85917 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 1660580163225 in words is "one trillion, six hundred sixty billion, five hundred eighty million, one hundred sixty-three thousand, two hundred twenty-five".