64545614646 has 32 divisors (see below), whose sum is σ = 130881979008. Its totient is φ = 21216847680.

The previous prime is 64545614599. The next prime is 64545614669. The reversal of 64545614646 is 64641654546.

It is a super-2 number, since 2×64545614646² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4033441 + ... + 4049411.

It is an arithmetic number, because the mean of its divisors is an integer number (4090061844).

Almost surely, 2^64545614646 is an apocalyptic number.

64545614646 is an abundant number, since it is smaller than the sum of its proper divisors (66336364362).

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

64545614646 is a wasteful number, since it uses less digits than its factorization.

64545614646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25276.

The product of its digits is 8294400, while the sum is 51.

The spelling of 64545614646 in words is "sixty-four billion, five hundred forty-five million, six hundred fourteen thousand, six hundred forty-six".