55215222172 has 24 divisors (see below), whose sum is σ = 105940598400. Its totient is φ = 24971704560.

The previous prime is 55215222151. The next prime is 55215222187. The reversal of 55215222172 is 27122251255.

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, 3144238 + ... + 3161749.

It is an arithmetic number, because the mean of its divisors is an integer number (4414191600).

Almost surely, 2^55215222172 is an apocalyptic number.

It is an amenable number.

55215222172 is a deficient number, since it is larger than the sum of its proper divisors (50725376228).

55215222172 is a wasteful number, since it uses less digits than its factorization.

55215222172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306201 (or 6306199 counting only the distinct ones).

The product of its digits is 28000, while the sum is 34.

The spelling of 55215222172 in words is "fifty-five billion, two hundred fifteen million, two hundred twenty-two thousand, one hundred seventy-two".