12491976157 has 2 divisors, whose sum is σ = 12491976158. Its totient is φ = 12491976156.

The previous prime is 12491976143. The next prime is 12491976179. The reversal of 12491976157 is 75167919421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12487839001 + 4137156 = 111749^2 + 2034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491976157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12491976257) 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, 6245988078 + 6245988079.

It is an arithmetic number, because the mean of its divisors is an integer number (6245988079).

Almost surely, 2^12491976157 is an apocalyptic number.

It is an amenable number.

12491976157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491976157 is an equidigital number, since it uses as much as digits as its factorization.

12491976157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The spelling of 12491976157 in words is "twelve billion, four hundred ninety-one million, nine hundred seventy-six thousand, one hundred fifty-seven".