64520607832820 has 24 divisors (see below), whose sum is σ = 138376112120064. Its totient is φ = 25259131576736.

The previous prime is 64520607832819. The next prime is 64520607832847. The reversal of 64520607832820 is 2823870602546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34319471312 + ... + 34319473191.

It is an arithmetic number, because the mean of its divisors is an integer number (5765671338336).

Almost surely, 2^{64520607832820} is an apocalyptic number.

It is an amenable number.

64520607832820 is an abundant number, since it is smaller than the sum of its proper divisors (73855504287244).

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

64520607832820 is a wasteful number, since it uses less digits than its factorization.

64520607832820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68638944559 (or 68638944557 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 64520607832820 in words is "sixty-four trillion, five hundred twenty billion, six hundred seven million, eight hundred thirty-two thousand, eight hundred twenty".