12656640003 has 16 divisors (see below), whose sum is σ = 19288617216. Its totient is φ = 7231500000.

The previous prime is 12656639951. The next prime is 12656640013. The reversal of 12656640003 is 30004665621.

It is not a de Polignac number, because 12656640003 - 2⁹ = 12656639491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12656640013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171253 + ... + 233753.

It is an arithmetic number, because the mean of its divisors is an integer number (1205538576).

Almost surely, 2^12656640003 is an apocalyptic number.

12656640003 is a deficient number, since it is larger than the sum of its proper divisors (6631977213).

12656640003 is an equidigital number, since it uses as much as digits as its factorization.

12656640003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72154.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 12656640003 in words is "twelve billion, six hundred fifty-six million, six hundred forty thousand, three".