12639657241 has 4 divisors (see below), whose sum is σ = 12791942352. Its totient is φ = 12487372132.

The previous prime is 12639657229. The next prime is 12639657293. The reversal of 12639657241 is 14275693621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14275693621 = 7 ⋅2039384803.

It is a cyclic number.

It is not a de Polignac number, because 12639657241 - 2¹⁷ = 12639526169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12639657191 and 12639657200.

It is not an unprimeable number, because it can be changed into a prime (12639657941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76142431 + ... + 76142596.

It is an arithmetic number, because the mean of its divisors is an integer number (3197985588).

Almost surely, 2^12639657241 is an apocalyptic number.

It is an amenable number.

12639657241 is a deficient number, since it is larger than the sum of its proper divisors (152285111).

12639657241 is an equidigital number, since it uses as much as digits as its factorization.

12639657241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152285110.

The product of its digits is 544320, while the sum is 46.

The spelling of 12639657241 in words is "twelve billion, six hundred thirty-nine million, six hundred fifty-seven thousand, two hundred forty-one".