12642921607651 has 2 divisors, whose sum is σ = 12642921607652. Its totient is φ = 12642921607650.

The previous prime is 12642921607639. The next prime is 12642921607727. The reversal of 12642921607651 is 15670612924621.

It is a weak prime.

It is an emirp because it is prime and its reverse (15670612924621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12642921607651 - 2²³ = 12642913219043 is a prime.

It is not a weakly prime, because it can be changed into another prime (12642921607601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321460803825 + 6321460803826.

It is an arithmetic number, because the mean of its divisors is an integer number (6321460803826).

Almost surely, 2^{12642921607651} is an apocalyptic number.

12642921607651 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642921607651 is an equidigital number, since it uses as much as digits as its factorization.

12642921607651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 12642921607651 in words is "twelve trillion, six hundred forty-two billion, nine hundred twenty-one million, six hundred seven thousand, six hundred fifty-one".