12156355242 has 12 divisors (see below), whose sum is σ = 26338769730. Its totient is φ = 4052118408.

The previous prime is 12156355219. The next prime is 12156355259. The reversal of 12156355242 is 24255365121.

12156355242 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 63 + 552 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6157697841 + 5998657401 = 78471^2 + 77451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12156355197 and 12156355206.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337676517 + ... + 337676552.

Almost surely, 2^12156355242 is an apocalyptic number.

12156355242 is an abundant number, since it is smaller than the sum of its proper divisors (14182414488).

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

12156355242 is a wasteful number, since it uses less digits than its factorization.

12156355242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675353077 (or 675353074 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The spelling of 12156355242 in words is "twelve billion, one hundred fifty-six million, three hundred fifty-five thousand, two hundred forty-two".