64969931664 has 135 divisors (see below), whose sum is σ = 199961414107. Its totient is φ = 19677662400.

The previous prime is 64969931641. The next prime is 64969931683. The reversal of 64969931664 is 46613996946.

The square root of 64969931664 is 254892.

It is a perfect power (a square), and thus also a powerful number.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 33644779 + ... + 33646709.

Almost surely, 2^64969931664 is an apocalyptic number.

64969931664 is the 254892-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64969931664

64969931664 is an abundant number, since it is smaller than the sum of its proper divisors (134991482443).

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

64969931664 is a wasteful number, since it uses less digits than its factorization.

64969931664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3898 (or 1947 counting only the distinct ones).

The product of its digits is 45349632, while the sum is 63.

The spelling of 64969931664 in words is "sixty-four billion, nine hundred sixty-nine million, nine hundred thirty-one thousand, six hundred sixty-four".