12649728779 has 2 divisors, whose sum is σ = 12649728780. Its totient is φ = 12649728778.

The previous prime is 12649728769. The next prime is 12649728799. The reversal of 12649728779 is 97782794621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12649728779 - 2²⁰ = 12648680203 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12649728769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6324864389 + 6324864390.

It is an arithmetic number, because the mean of its divisors is an integer number (6324864390).

Almost surely, 2^12649728779 is an apocalyptic number.

12649728779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12649728779 is an equidigital number, since it uses as much as digits as its factorization.

12649728779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 62.

The spelling of 12649728779 in words is "twelve billion, six hundred forty-nine million, seven hundred twenty-eight thousand, seven hundred seventy-nine".