12156105177 has 24 divisors (see below), whose sum is σ = 17756980488. Its totient is φ = 8012832000.

The previous prime is 12156105167. The next prime is 12156105191. The reversal of 12156105177 is 77150165121.

It is a happy number.

12156105177 is a `hidden beast` number, since 1 + 21 + 5 + 610 + 5 + 17 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2026890441 + 10129214736 = 45021^2 + 100644^2 .

It is not a de Polignac number, because 12156105177 - 2¹⁹ = 12155580889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12156105127) 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 in 23 ways as a sum of consecutive naturals, for example, 682963 + ... + 700535.

It is an arithmetic number, because the mean of its divisors is an integer number (739874187).

Almost surely, 2^12156105177 is an apocalyptic number.

It is an amenable number.

12156105177 is a deficient number, since it is larger than the sum of its proper divisors (5600875311).

12156105177 is a wasteful number, since it uses less digits than its factorization.

12156105177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18441 (or 18438 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 36.

The spelling of 12156105177 in words is "twelve billion, one hundred fifty-six million, one hundred five thousand, one hundred seventy-seven".