12640963506 has 16 divisors (see below), whose sum is σ = 25392331200. Its totient is φ = 4195253808.

The previous prime is 12640963501. The next prime is 12640963519. The reversal of 12640963506 is 60536904621.

It is not an unprimeable number, because it can be changed into a prime (12640963501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4598686 + ... + 4601433.

It is an arithmetic number, because the mean of its divisors is an integer number (1587020700).

Almost surely, 2^12640963506 is an apocalyptic number.

12640963506 is an abundant number, since it is smaller than the sum of its proper divisors (12751367694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640963506 is a wasteful number, since it uses less digits than its factorization.

12640963506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9200353.

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 12640963506 in words is "twelve billion, six hundred forty million, nine hundred sixty-three thousand, five hundred six".