72331351080172 has 6 divisors (see below), whose sum is σ = 126579864390308. Its totient is φ = 36165675540084.

The previous prime is 72331351080137. The next prime is 72331351080211. The reversal of 72331351080172 is 27108015313327.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9041418885018 + ... + 9041418885025.

Almost surely, 2^{72331351080172} is an apocalyptic number.

It is an amenable number.

72331351080172 is a deficient number, since it is larger than the sum of its proper divisors (54248513310136).

72331351080172 is a wasteful number, since it uses less digits than its factorization.

72331351080172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18082837770047 (or 18082837770045 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

Adding to 72331351080172 its reverse (27108015313327), we get a palindrome (99439366393499).

The spelling of 72331351080172 in words is "seventy-two trillion, three hundred thirty-one billion, three hundred fifty-one million, eighty thousand, one hundred seventy-two".