165225515624 has 64 divisors (see below), whose sum is σ = 341276006400. Its totient is φ = 74527858944.

The previous prime is 165225515591. The next prime is 165225515639. The reversal of 165225515624 is 426515522561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791582 + ... + 978290.

It is an arithmetic number, because the mean of its divisors is an integer number (5332437600).

Almost surely, 2^165225515624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165225515624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170638003200).

165225515624 is an abundant number, since it is smaller than the sum of its proper divisors (176050490776).

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

165225515624 is a wasteful number, since it uses less digits than its factorization.

165225515624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186922 (or 186918 counting only the distinct ones).

The product of its digits is 720000, while the sum is 44.

The spelling of 165225515624 in words is "one hundred sixty-five billion, two hundred twenty-five million, five hundred fifteen thousand, six hundred twenty-four".