64757876021 has 32 divisors (see below), whose sum is σ = 69961881600. Its totient is φ = 59796728640.

The previous prime is 64757875999. The next prime is 64757876039. The reversal of 64757876021 is 12067875746.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64757876021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64757876041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35366576 + ... + 35368406.

It is an arithmetic number, because the mean of its divisors is an integer number (2186308800).

Almost surely, 2^64757876021 is an apocalyptic number.

It is an amenable number.

64757876021 is a deficient number, since it is larger than the sum of its proper divisors (5204005579).

64757876021 is a wasteful number, since it uses less digits than its factorization.

64757876021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 64757876021 in words is "sixty-four billion, seven hundred fifty-seven million, eight hundred seventy-six thousand, twenty-one".