22161155661172 has 12 divisors (see below), whose sum is σ = 42307660807776. Its totient is φ = 10073252573240.

The previous prime is 22161155661163. The next prime is 22161155661173. The reversal of 22161155661172 is 27116655116122.

It is a super-2 number, since 2×22161155661172² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161155661173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251831314288 + ... + 251831314375.

It is an arithmetic number, because the mean of its divisors is an integer number (3525638400648).

Almost surely, 2^{22161155661172} is an apocalyptic number.

22161155661172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22161155661172 is a deficient number, since it is larger than the sum of its proper divisors (20146505146604).

22161155661172 is a wasteful number, since it uses less digits than its factorization.

22161155661172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503662628678 (or 503662628676 counting only the distinct ones).

The product of its digits is 302400, while the sum is 46.

The spelling of 22161155661172 in words is "twenty-two trillion, one hundred sixty-one billion, one hundred fifty-five million, six hundred sixty-one thousand, one hundred seventy-two".