165015610655625 has 120 divisors (see below), whose sum is σ = 303336575599200. Its totient is φ = 86391334080000.

The previous prime is 165015610655591. The next prime is 165015610655689. The reversal of 165015610655625 is 526556016510561.

165015610655625 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 1 + 5 + 6 + 1 + 0 + 6 + 5 + 5 + 625 = 666.

It is not a de Polignac number, because 165015610655625 - 2¹⁷ = 165015610524553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 228965841 + ... + 229685409.

It is an arithmetic number, because the mean of its divisors is an integer number (2527804796660).

Almost surely, 2^{165015610655625} is an apocalyptic number.

165015610655625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165015610655625 is a deficient number, since it is larger than the sum of its proper divisors (138320964943575).

165015610655625 is an equidigital number, since it uses as much as digits as its factorization.

165015610655625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720345 (or 720327 counting only the distinct ones).

The product of its (nonzero) digits is 8100000, while the sum is 54.

The spelling of 165015610655625 in words is "one hundred sixty-five trillion, fifteen billion, six hundred ten million, six hundred fifty-five thousand, six hundred twenty-five".