55111311311172 has 24 divisors (see below), whose sum is σ = 128653917835296. Its totient is φ = 18361743088128.

The previous prime is 55111311311171. The next prime is 55111311311191. The reversal of 55111311311172 is 27111311311155.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55111311311171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086725538 + ... + 1086776249.

It is an arithmetic number, because the mean of its divisors is an integer number (5360579909804).

Almost surely, 2^{55111311311172} is an apocalyptic number.

It is an amenable number.

55111311311172 is an abundant number, since it is smaller than the sum of its proper divisors (73542606524124).

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

55111311311172 is a wasteful number, since it uses less digits than its factorization.

55111311311172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173503907 (or 2173503905 counting only the distinct ones).

The product of its digits is 3150, while the sum is 33.

The spelling of 55111311311172 in words is "fifty-five trillion, one hundred eleven billion, three hundred eleven million, three hundred eleven thousand, one hundred seventy-two".