64535606644 has 24 divisors (see below), whose sum is σ = 118897788800. Its totient is φ = 30565278720.

The previous prime is 64535606617. The next prime is 64535606651. The reversal of 64535606644 is 44660653546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534964 + ... + 644404.

Almost surely, 2^64535606644 is an apocalyptic number.

It is an amenable number.

64535606644 is a deficient number, since it is larger than the sum of its proper divisors (54362182156).

64535606644 is a wasteful number, since it uses less digits than its factorization.

64535606644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117223 (or 117221 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 64535606644 in words is "sixty-four billion, five hundred thirty-five million, six hundred six thousand, six hundred forty-four".