72172537574 has 4 divisors (see below), whose sum is σ = 108258806364. Its totient is φ = 36086268786.

The previous prime is 72172537573. The next prime is 72172537589. The reversal of 72172537574 is 47573527127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72172537573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18043134392 + ... + 18043134395.

It is an arithmetic number, because the mean of its divisors is an integer number (27064701591).

Almost surely, 2^72172537574 is an apocalyptic number.

72172537574 is a deficient number, since it is larger than the sum of its proper divisors (36086268790).

72172537574 is a wasteful number, since it uses less digits than its factorization.

72172537574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36086268789.

The product of its digits is 2881200, while the sum is 50.

The spelling of 72172537574 in words is "seventy-two billion, one hundred seventy-two million, five hundred thirty-seven thousand, five hundred seventy-four".