64528434571656 has 64 divisors (see below), whose sum is σ = 175988416046400. Its totient is φ = 19553873715200.

The previous prime is 64528434571637. The next prime is 64528434571661. The reversal of 64528434571656 is 65617543482546.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 26118136 + ... + 28481816.

It is an arithmetic number, because the mean of its divisors is an integer number (2749819000725).

Almost surely, 2^{64528434571656} is an apocalyptic number.

64528434571656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

64528434571656 is an abundant number, since it is smaller than the sum of its proper divisors (111459981474744).

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

64528434571656 is a wasteful number, since it uses less digits than its factorization.

64528434571656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467110 (or 2467106 counting only the distinct ones).

The product of its digits is 580608000, while the sum is 66.

The spelling of 64528434571656 in words is "sixty-four trillion, five hundred twenty-eight billion, four hundred thirty-four million, five hundred seventy-one thousand, six hundred fifty-six".