71993475856 has 15 divisors (see below), whose sum is σ = 139489438951. Its totient is φ = 35996201296.

The previous prime is 71993475839. The next prime is 71993475881. The reversal of 71993475856 is 65857439917.

The square root of 71993475856 is 268316.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1039725 + ... + 1106803.

Almost surely, 2^71993475856 is an apocalyptic number.

71993475856 is the 268316-th square number.

It is an amenable number.

71993475856 is a deficient number, since it is larger than the sum of its proper divisors (67495963095).

71993475856 is an frugal number, since it uses more digits than its factorization.

71993475856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134166 (or 67081 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 64.

Multiplying 71993475856 by its sum of digits (64), we get a square (4607582454784 = 2146528²).

The spelling of 71993475856 in words is "seventy-one billion, nine hundred ninety-three million, four hundred seventy-five thousand, eight hundred fifty-six".