71916221584 has 15 divisors (see below), whose sum is σ = 139339757683. Its totient is φ = 35957574448.

The previous prime is 71916221581. The next prime is 71916221591. The reversal of 71916221584 is 48512261917.

The square root of 71916221584 is 268172.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71916221581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1039167 + ... + 1106209.

Almost surely, 2^71916221584 is an apocalyptic number.

71916221584 is the 268172-nd square number.

It is an amenable number.

71916221584 is a deficient number, since it is larger than the sum of its proper divisors (67423536099).

71916221584 is an frugal number, since it uses more digits than its factorization.

71916221584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134094 (or 67045 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The spelling of 71916221584 in words is "seventy-one billion, nine hundred sixteen million, two hundred twenty-one thousand, five hundred eighty-four".