22161611116172 has 48 divisors (see below), whose sum is σ = 42345205056000. Its totient is φ = 10064729228160.

The previous prime is 22161611116147. The next prime is 22161611116199. The reversal of 22161611116172 is 27161111616122.

It is a happy number.

It is a super-2 number, since 2×22161611116172² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800824928 + ... + 800852600.

It is an arithmetic number, because the mean of its divisors is an integer number (882191772000).

Almost surely, 2^{22161611116172} is an apocalyptic number.

22161611116172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22161611116172 is a deficient number, since it is larger than the sum of its proper divisors (20183593939828).

22161611116172 is a wasteful number, since it uses less digits than its factorization.

22161611116172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42806 (or 42804 counting only the distinct ones).

The product of its digits is 12096, while the sum is 38.

It can be divided in two parts, 2216161 and 1116172, that added together give a palindrome (3332333).

The spelling of 22161611116172 in words is "twenty-two trillion, one hundred sixty-one billion, six hundred eleven million, one hundred sixteen thousand, one hundred seventy-two".