12156768122 has 4 divisors (see below), whose sum is σ = 18235152186. Its totient is φ = 6078384060.

The previous prime is 12156768121. The next prime is 12156768161. The reversal of 12156768122 is 22186765121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22186765121 = 61 ⋅363717461.

It can be written as a sum of positive squares in only one way, i.e., 9771520201 + 2385247921 = 98851^2 + 48839^2 .

It is a super-2 number, since 2×12156768122² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12156768122.

It is not an unprimeable number, because it can be changed into a prime (12156768121) by changing a digit.

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 as a sum of consecutive naturals, namely, 3039192029 + ... + 3039192032.

Almost surely, 2^12156768122 is an apocalyptic number.

12156768122 is a deficient number, since it is larger than the sum of its proper divisors (6078384064).

12156768122 is an equidigital number, since it uses as much as digits as its factorization.

12156768122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078384063.

The product of its digits is 80640, while the sum is 41.

The spelling of 12156768122 in words is "twelve billion, one hundred fifty-six million, seven hundred sixty-eight thousand, one hundred twenty-two".