12157172388 has 144 divisors (see below), whose sum is σ = 32536736960. Its totient is φ = 3968092800.

The previous prime is 12157172369. The next prime is 12157172407. The reversal of 12157172388 is 88327175121.

12157172388 is a `hidden beast` number, since 1 + 2 + 1 + 571 + 72 + 3 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (12157172369) and next prime (12157172407).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22471398 + ... + 22471938.

Almost surely, 2^12157172388 is an apocalyptic number.

12157172388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12157172388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16268368480).

12157172388 is an abundant number, since it is smaller than the sum of its proper divisors (20379564572).

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

12157172388 is a wasteful number, since it uses less digits than its factorization.

12157172388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 986 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The spelling of 12157172388 in words is "twelve billion, one hundred fifty-seven million, one hundred seventy-two thousand, three hundred eighty-eight".