64445632625 has 32 divisors (see below), whose sum is σ = 90570175488. Its totient is φ = 45357600000.

The previous prime is 64445632609. The next prime is 64445632637. The reversal of 64445632625 is 52623654446.

It is not a de Polignac number, because 64445632625 - 2⁴ = 64445632609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64445632625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 713336 + ... + 798585.

It is an arithmetic number, because the mean of its divisors is an integer number (2830317984).

Almost surely, 2^64445632625 is an apocalyptic number.

It is an amenable number.

64445632625 is a deficient number, since it is larger than the sum of its proper divisors (26124542863).

64445632625 is a wasteful number, since it uses less digits than its factorization.

64445632625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511978 (or 1511968 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 47.

The spelling of 64445632625 in words is "sixty-four billion, four hundred forty-five million, six hundred thirty-two thousand, six hundred twenty-five".