71573578816 has 28 divisors (see below), whose sum is σ = 149504024080. Its totient is φ = 33903273600.

The previous prime is 71573578771. The next prime is 71573578883. The reversal of 71573578816 is 61887537517.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29428710 + ... + 29431141.

Almost surely, 2^71573578816 is an apocalyptic number.

71573578816 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

71573578816 is an abundant number, since it is smaller than the sum of its proper divisors (77930445264).

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

71573578816 is a wasteful number, since it uses less digits than its factorization.

71573578816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58859882 (or 58859872 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 58.

The spelling of 71573578816 in words is "seventy-one billion, five hundred seventy-three million, five hundred seventy-eight thousand, eight hundred sixteen".