64977696396 has 48 divisors (see below), whose sum is σ = 170490364800. Its totient is φ = 21398274576.

The previous prime is 64977696389. The next prime is 64977696397. The reversal of 64977696396 is 69369677946.

64977696396 is a `hidden beast` number, since 6 + 497 + 76 + 9 + 63 + 9 + 6 = 666.

It is a super-3 number, since 3×64977696396³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (64977696397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3615406 + ... + 3633333.

It is an arithmetic number, because the mean of its divisors is an integer number (3551882600).

Almost surely, 2^64977696396 is an apocalyptic number.

It is an amenable number.

64977696396 is an abundant number, since it is smaller than the sum of its proper divisors (105512668404).

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

64977696396 is a wasteful number, since it uses less digits than its factorization.

64977696396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248835 (or 7248827 counting only the distinct ones).

The product of its digits is 555532992, while the sum is 72.

The spelling of 64977696396 in words is "sixty-four billion, nine hundred seventy-seven million, six hundred ninety-six thousand, three hundred ninety-six".