12643170157 has 2 divisors, whose sum is σ = 12643170158. Its totient is φ = 12643170156.

The previous prime is 12643170131. The next prime is 12643170161. The reversal of 12643170157 is 75107134621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12585698596 + 57471561 = 112186^2 + 7581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12643170157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12643174157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321585078 + 6321585079.

It is an arithmetic number, because the mean of its divisors is an integer number (6321585079).

Almost surely, 2^12643170157 is an apocalyptic number.

It is an amenable number.

12643170157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12643170157 is an equidigital number, since it uses as much as digits as its factorization.

12643170157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

It can be divided in two parts, 1264 and 3170157, that added together give a triangular number (3171421 = T₂₅₁₈).

The spelling of 12643170157 in words is "twelve billion, six hundred forty-three million, one hundred seventy thousand, one hundred fifty-seven".