165510601066025 has 48 divisors (see below), whose sum is σ = 212419661414400. Its totient is φ = 127776750447360.

The previous prime is 165510601065961. The next prime is 165510601066049. The reversal of 165510601066025 is 520660106015561.

It is a happy number.

It is not a de Polignac number, because 165510601066025 - 2⁶ = 165510601065961 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21809272931 + ... + 21809280519.

It is an arithmetic number, because the mean of its divisors is an integer number (4425409612800).

Almost surely, 2^{165510601066025} is an apocalyptic number.

It is an amenable number.

165510601066025 is a deficient number, since it is larger than the sum of its proper divisors (46909060348375).

165510601066025 is a wasteful number, since it uses less digits than its factorization.

165510601066025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19178 (or 19173 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 165510601066025 in words is "one hundred sixty-five trillion, five hundred ten billion, six hundred one million, sixty-six thousand, twenty-five".