13656220064609 has 2 divisors, whose sum is σ = 13656220064610. Its totient is φ = 13656220064608.

The previous prime is 13656220064581. The next prime is 13656220064653. The reversal of 13656220064609 is 90646002265631.

13656220064609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12590411600209 + 1065808464400 = 3548297^2 + 1032380^2 .

It is a cyclic number.

It is not a de Polignac number, because 13656220064609 - 2³⁶ = 13587500587873 is a prime.

It is not a weakly prime, because it can be changed into another prime (13656220064689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828110032304 + 6828110032305.

It is an arithmetic number, because the mean of its divisors is an integer number (6828110032305).

Almost surely, 2^{13656220064609} is an apocalyptic number.

It is an amenable number.

13656220064609 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656220064609 is an equidigital number, since it uses as much as digits as its factorization.

13656220064609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 13656220064609 in words is "thirteen trillion, six hundred fifty-six billion, two hundred twenty million, sixty-four thousand, six hundred nine".