64521597168 has 140 divisors (see below), whose sum is σ = 214206157488. Its totient is φ = 18434718720.

The previous prime is 64521597163. The next prime is 64521597193. The reversal of 64521597168 is 86179512546.

It is a happy number.

64521597168 is a `hidden beast` number, since 6 + 4 + 521 + 59 + 7 + 1 + 68 = 666.

It is a super-2 number, since 2×64521597168² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521597163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 313473 + ... + 476768.

Almost surely, 2^64521597168 is an apocalyptic number.

It is an amenable number.

64521597168 is an abundant number, since it is smaller than the sum of its proper divisors (149684560320).

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

64521597168 is an equidigital number, since it uses as much as digits as its factorization.

64521597168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790274 (or 790253 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 64521597168 in words is "sixty-four billion, five hundred twenty-one million, five hundred ninety-seven thousand, one hundred sixty-eight".