64716685824 has 480 divisors, whose sum is σ = 216585173376. Its totient is φ = 16762798080.

The previous prime is 64716685801. The next prime is 64716685843. The reversal of 64716685824 is 42858661746.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 153721134 + ... + 153721554.

Almost surely, 2^64716685824 is an apocalyptic number.

64716685824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64716685824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108292586688).

64716685824 is an abundant number, since it is smaller than the sum of its proper divisors (151868487552).

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

64716685824 is a wasteful number, since it uses less digits than its factorization.

64716685824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 479 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 57.

The spelling of 64716685824 in words is "sixty-four billion, seven hundred sixteen million, six hundred eighty-five thousand, eight hundred twenty-four".