165651766625 has 16 divisors (see below), whose sum is σ = 213402229248. Its totient is φ = 128246526000.

The previous prime is 165651766597. The next prime is 165651766661. The reversal of 165651766625 is 526667156561.

It is a happy number.

165651766625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165651766625 - 2⁶ = 165651766561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21370547 + ... + 21378296.

It is an arithmetic number, because the mean of its divisors is an integer number (13337639328).

Almost surely, 2^165651766625 is an apocalyptic number.

It is an amenable number.

165651766625 is a deficient number, since it is larger than the sum of its proper divisors (47750462623).

165651766625 is an equidigital number, since it uses as much as digits as its factorization.

165651766625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42748889 (or 42748879 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 56.

The spelling of 165651766625 in words is "one hundred sixty-five billion, six hundred fifty-one million, seven hundred sixty-six thousand, six hundred twenty-five".