64577021967 has 36 divisors (see below), whose sum is σ = 99140750280. Its totient is φ = 40497192192.

The previous prime is 64577021939. The next prime is 64577022089. The reversal of 64577021967 is 76912077546.

64577021967 is a `hidden beast` number, since 6 + 4 + 577 + 0 + 2 + 1 + 9 + 67 = 666.

It is not a de Polignac number, because 64577021967 - 2²³ = 64568633359 is a prime.

It is a super-2 number, since 2×64577021967² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64572021967) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5828509 + ... + 5839577.

It is an arithmetic number, because the mean of its divisors is an integer number (2753909730).

Almost surely, 2^64577021967 is an apocalyptic number.

64577021967 is a deficient number, since it is larger than the sum of its proper divisors (34563728313).

64577021967 is a wasteful number, since it uses less digits than its factorization.

64577021967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13352 (or 13332 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 54.

The spelling of 64577021967 in words is "sixty-four billion, five hundred seventy-seven million, twenty-one thousand, nine hundred sixty-seven".