71395517664 has 60 divisors (see below), whose sum is σ = 209972241864. Its totient is φ = 23798505024.

The previous prime is 71395517653. The next prime is 71395517681. The reversal of 71395517664 is 46671559317.

71395517664 is a `hidden beast` number, since 7 + 13 + 9 + 551 + 76 + 6 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 71395517664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13769692 + ... + 13774875.

Almost surely, 2^71395517664 is an apocalyptic number.

It is an amenable number.

71395517664 is an abundant number, since it is smaller than the sum of its proper divisors (138576724200).

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

71395517664 is a wasteful number, since it uses less digits than its factorization.

71395517664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27544589 (or 27544572 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The spelling of 71395517664 in words is "seventy-one billion, three hundred ninety-five million, five hundred seventeen thousand, six hundred sixty-four".