12172155464 has 24 divisors (see below), whose sum is σ = 26548962390. Its totient is φ = 5216637888.

The previous prime is 12172155371. The next prime is 12172155467. The reversal of 12172155464 is 46455127121.

It can be written as a sum of positive squares in only one way, i.e., 6356872900 + 5815282564 = 79730^2 + 76258^2 .

It is a super-2 number, since 2×12172155464² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12172155467) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15525317 + ... + 15526100.

Almost surely, 2^12172155464 is an apocalyptic number.

12172155464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12172155464 is an abundant number, since it is smaller than the sum of its proper divisors (14376806926).

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

12172155464 is a wasteful number, since it uses less digits than its factorization.

12172155464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31051437 (or 31051426 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The spelling of 12172155464 in words is "twelve billion, one hundred seventy-two million, one hundred fifty-five thousand, four hundred sixty-four".