22155517172 has 12 divisors (see below), whose sum is σ = 41052870180. Its totient is φ = 10426125696.

The previous prime is 22155517159. The next prime is 22155517177. The reversal of 22155517172 is 27171555122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12917231716 + 9238285456 = 113654^2 + 96116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155517177) 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, 162908147 + ... + 162908282.

It is an arithmetic number, because the mean of its divisors is an integer number (3421072515).

Almost surely, 2^22155517172 is an apocalyptic number.

It is an amenable number.

22155517172 is a deficient number, since it is larger than the sum of its proper divisors (18897353008).

22155517172 is a wasteful number, since it uses less digits than its factorization.

22155517172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325816450 (or 325816448 counting only the distinct ones).

The product of its digits is 49000, while the sum is 38.

The spelling of 22155517172 in words is "twenty-two billion, one hundred fifty-five million, five hundred seventeen thousand, one hundred seventy-two".