12656257742 has 4 divisors (see below), whose sum is σ = 18984386616. Its totient is φ = 6328128870.

The previous prime is 12656257741. The next prime is 12656257769. The reversal of 12656257742 is 24775265621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24775265621 = 19993 ⋅1239197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656257741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3164064434 + ... + 3164064437.

It is an arithmetic number, because the mean of its divisors is an integer number (4746096654).

Almost surely, 2^12656257742 is an apocalyptic number.

12656257742 is a deficient number, since it is larger than the sum of its proper divisors (6328128874).

12656257742 is an equidigital number, since it uses as much as digits as its factorization.

12656257742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6328128873.

The product of its digits is 1411200, while the sum is 47.

The spelling of 12656257742 in words is "twelve billion, six hundred fifty-six million, two hundred fifty-seven thousand, seven hundred forty-two".