55167185721 has 32 divisors (see below), whose sum is σ = 76540147200. Its totient is φ = 35301692160.

The previous prime is 55167185627. The next prime is 55167185737. The reversal of 55167185721 is 12758176155.

It is a happy number.

55167185721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-55167185721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55167186721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11998395 + ... + 12002991.

It is an arithmetic number, because the mean of its divisors is an integer number (2391879600).

Almost surely, 2^55167185721 is an apocalyptic number.

It is an amenable number.

55167185721 is a deficient number, since it is larger than the sum of its proper divisors (21372961479).

55167185721 is a wasteful number, since it uses less digits than its factorization.

55167185721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409.

The product of its digits is 588000, while the sum is 48.

The spelling of 55167185721 in words is "fifty-five billion, one hundred sixty-seven million, one hundred eighty-five thousand, seven hundred twenty-one".