71663557290816 has 56 divisors (see below), whose sum is σ = 200763348007680. Its totient is φ = 22482684639232.

The previous prime is 71663557290779. The next prime is 71663557290851. The reversal of 71663557290816 is 61809275536617.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10977870096 + ... + 10977876623.

Almost surely, 2^{71663557290816} is an apocalyptic number.

It is an amenable number.

71663557290816 is an abundant number, since it is smaller than the sum of its proper divisors (129099790716864).

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

71663557290816 is a wasteful number, since it uses less digits than its factorization.

71663557290816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21955746751 (or 21955746741 counting only the distinct ones).

The product of its (nonzero) digits is 114307200, while the sum is 66.

The spelling of 71663557290816 in words is "seventy-one trillion, six hundred sixty-three billion, five hundred fifty-seven million, two hundred ninety thousand, eight hundred sixteen".