3218655238172 has 24 divisors (see below), whose sum is σ = 6145337210880. Its totient is φ = 1462874690160.

The previous prime is 3218655238147. The next prime is 3218655238189. The reversal of 3218655238172 is 2718325568123.

It is a super-3 number, since 3×3218655238172³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3327068 + ... + 4184099.

It is an arithmetic number, because the mean of its divisors is an integer number (256055717120).

Almost surely, 2^{3218655238172} is an apocalyptic number.

It is an amenable number.

3218655238172 is a deficient number, since it is larger than the sum of its proper divisors (2926681972708).

3218655238172 is a wasteful number, since it uses less digits than its factorization.

3218655238172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520921 (or 7520919 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 53.

The spelling of 3218655238172 in words is "three trillion, two hundred eighteen billion, six hundred fifty-five million, two hundred thirty-eight thousand, one hundred seventy-two".