71572716864 has 168 divisors, whose sum is σ = 227594708640. Its totient is φ = 21320985600.

The previous prime is 71572716857. The next prime is 71572716931. The reversal of 71572716864 is 46861727517.

71572716864 is a `hidden beast` number, since 7 + 1 + 572 + 7 + 1 + 6 + 8 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 71572716864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278094 + ... + 469554.

Almost surely, 2^71572716864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71572716864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113797354320).

71572716864 is an abundant number, since it is smaller than the sum of its proper divisors (156021991776).

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

71572716864 is a wasteful number, since it uses less digits than its factorization.

71572716864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191549 (or 191536 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The spelling of 71572716864 in words is "seventy-one billion, five hundred seventy-two million, seven hundred sixteen thousand, eight hundred sixty-four".