13140565657 has 4 divisors (see below), whose sum is σ = 13140947556. Its totient is φ = 13140183760.

The previous prime is 13140565639. The next prime is 13140565679. The reversal of 13140565657 is 75656504131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2070159001 + 11070406656 = 45499^2 + 105216^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140565657 - 2²³ = 13132177049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13140562657) 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 3 ways as a sum of consecutive naturals, for example, 133594 + ... + 210067.

It is an arithmetic number, because the mean of its divisors is an integer number (3285236889).

Almost surely, 2^13140565657 is an apocalyptic number.

It is an amenable number.

13140565657 is a deficient number, since it is larger than the sum of its proper divisors (381899).

13140565657 is an equidigital number, since it uses as much as digits as its factorization.

13140565657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381898.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 13140565657 in words is "thirteen billion, one hundred forty million, five hundred sixty-five thousand, six hundred fifty-seven".