72615121172 has 96 divisors (see below), whose sum is σ = 148406670720. Its totient is φ = 30723768320.

The previous prime is 72615121129. The next prime is 72615121199. The reversal of 72615121172 is 27112151627.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26375348 + ... + 26378100.

It is an arithmetic number, because the mean of its divisors is an integer number (1545902820).

Almost surely, 2^72615121172 is an apocalyptic number.

It is an amenable number.

72615121172 is an abundant number, since it is smaller than the sum of its proper divisors (75791549548).

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

72615121172 is a wasteful number, since it uses less digits than its factorization.

72615121172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161 (or 3159 counting only the distinct ones).

The product of its digits is 11760, while the sum is 35.

Adding to 72615121172 its reverse (27112151627), we get a palindrome (99727272799).

The spelling of 72615121172 in words is "seventy-two billion, six hundred fifteen million, one hundred twenty-one thousand, one hundred seventy-two".