64642558812 has 36 divisors (see below), whose sum is σ = 163327653720. Its totient is φ = 19890017472.

The previous prime is 64642558807. The next prime is 64642558817. The reversal of 64642558812 is 21885524646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64642558807) and next prime (64642558817).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642558817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15935487 + ... + 15939542.

It is an arithmetic number, because the mean of its divisors is an integer number (4536879270).

Almost surely, 2^64642558812 is an apocalyptic number.

It is an amenable number.

64642558812 is an abundant number, since it is smaller than the sum of its proper divisors (98685094908).

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

64642558812 is a wasteful number, since it uses less digits than its factorization.

64642558812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31875062 (or 31875047 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 51.

The spelling of 64642558812 in words is "sixty-four billion, six hundred forty-two million, five hundred fifty-eight thousand, eight hundred twelve".