72133781658 has 32 divisors (see below), whose sum is σ = 149084286912. Its totient is φ = 23252880000.

The previous prime is 72133781627. The next prime is 72133781677. The reversal of 72133781658 is 85618733127.

It is a self number, because there is not a number n which added to its sum of digits gives 72133781658.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1358043 + ... + 1410158.

It is an arithmetic number, because the mean of its divisors is an integer number (4658883966).

Almost surely, 2^72133781658 is an apocalyptic number.

72133781658 is an abundant number, since it is smaller than the sum of its proper divisors (76950505254).

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

72133781658 is a wasteful number, since it uses less digits than its factorization.

72133781658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768350.

The product of its digits is 1693440, while the sum is 51.

The spelling of 72133781658 in words is "seventy-two billion, one hundred thirty-three million, seven hundred eighty-one thousand, six hundred fifty-eight".