20664810679 has 2 divisors, whose sum is σ = 20664810680. Its totient is φ = 20664810678.

The previous prime is 20664810559. The next prime is 20664810721. The reversal of 20664810679 is 97601846602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20664810679 - 2³³ = 12074876087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20664510679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332405339 + 10332405340.

It is an arithmetic number, because the mean of its divisors is an integer number (10332405340).

Almost surely, 2^20664810679 is an apocalyptic number.

20664810679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664810679 is an equidigital number, since it uses as much as digits as its factorization.

20664810679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 20664810679 in words is "twenty billion, six hundred sixty-four million, eight hundred ten thousand, six hundred seventy-nine".