725644165632 has 80 divisors (see below), whose sum is σ = 1999822271040. Its totient is φ = 233540636672.

The previous prime is 725644165627. The next prime is 725644165633. The reversal of 725644165632 is 236561446527.

It is a super-2 number, since 2×725644165632² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (725644165633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8100708 + ... + 8189795.

It is an arithmetic number, because the mean of its divisors is an integer number (24997778388).

Almost surely, 2^725644165632 is an apocalyptic number.

It is an amenable number.

725644165632 is an abundant number, since it is smaller than the sum of its proper divisors (1274178105408).

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

725644165632 is a wasteful number, since it uses less digits than its factorization.

725644165632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16290553 (or 16290537 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 51.

The spelling of 725644165632 in words is "seven hundred twenty-five billion, six hundred forty-four million, one hundred sixty-five thousand, six hundred thirty-two".