64646446425 has 24 divisors (see below), whose sum is σ = 116598683040. Its totient is φ = 31343731200.

The previous prime is 64646446411. The next prime is 64646446441. The reversal of 64646446425 is 52464464646.

It is not a de Polignac number, because 64646446425 - 2²⁰ = 64645397849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39178840 + ... + 39180489.

It is an arithmetic number, because the mean of its divisors is an integer number (4858278460).

Almost surely, 2^64646446425 is an apocalyptic number.

It is an amenable number.

64646446425 is a deficient number, since it is larger than the sum of its proper divisors (51952236615).

64646446425 is a wasteful number, since it uses less digits than its factorization.

64646446425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78359353 (or 78359348 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 51.

The spelling of 64646446425 in words is "sixty-four billion, six hundred forty-six million, four hundred forty-six thousand, four hundred twenty-five".