64920920577 has 32 divisors (see below), whose sum is σ = 93327962112. Its totient is φ = 39996923904.

The previous prime is 64920920551. The next prime is 64920920579. The reversal of 64920920577 is 77502902946.

It is not a de Polignac number, because 64920920577 - 2¹⁴ = 64920904193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (64920920579) 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, 576603 + ... + 679935.

It is an arithmetic number, because the mean of its divisors is an integer number (2916498816).

Almost surely, 2^64920920577 is an apocalyptic number.

It is an amenable number.

64920920577 is a deficient number, since it is larger than the sum of its proper divisors (28407041535).

64920920577 is a wasteful number, since it uses less digits than its factorization.

64920920577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103577.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 64920920577 in words is "sixty-four billion, nine hundred twenty million, nine hundred twenty thousand, five hundred seventy-seven".