12542140657 has 2 divisors, whose sum is σ = 12542140658. Its totient is φ = 12542140656.

The previous prime is 12542140607. The next prime is 12542140697. The reversal of 12542140657 is 75604124521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9200838241 + 3341302416 = 95921^2 + 57804^2 .

It is a cyclic number.

It is not a de Polignac number, because 12542140657 - 2²⁷ = 12407922929 is a prime.

It is not a weakly prime, because it can be changed into another prime (12542140607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271070328 + 6271070329.

It is an arithmetic number, because the mean of its divisors is an integer number (6271070329).

Almost surely, 2^12542140657 is an apocalyptic number.

It is an amenable number.

12542140657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12542140657 is an equidigital number, since it uses as much as digits as its factorization.

12542140657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 12542140657 in words is "twelve billion, five hundred forty-two million, one hundred forty thousand, six hundred fifty-seven".