64431264555 has 48 divisors (see below), whose sum is σ = 129540313344. Its totient is φ = 29014666560.

The previous prime is 64431264539. The next prime is 64431264589. The reversal of 64431264555 is 55546213446.

64431264555 is a `hidden beast` number, since 6 + 4 + 4 + 31 + 2 + 64 + 555 = 666.

It is not a de Polignac number, because 64431264555 - 2⁴ = 64431264539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64431264555.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1505341 + ... + 1547550.

It is an arithmetic number, because the mean of its divisors is an integer number (2698756528).

Almost surely, 2^64431264555 is an apocalyptic number.

64431264555 is an abundant number, since it is smaller than the sum of its proper divisors (65109048789).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64431264555 is a wasteful number, since it uses less digits than its factorization.

64431264555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052976 (or 3052973 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The spelling of 64431264555 in words is "sixty-four billion, four hundred thirty-one million, two hundred sixty-four thousand, five hundred fifty-five".