20875968779 has 2 divisors, whose sum is σ = 20875968780. Its totient is φ = 20875968778.

The previous prime is 20875968749. The next prime is 20875968787. The reversal of 20875968779 is 97786957802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20875968779 is a prime.

It is not a weakly prime, because it can be changed into another prime (20875968749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437984389 + 10437984390.

It is an arithmetic number, because the mean of its divisors is an integer number (10437984390).

Almost surely, 2^20875968779 is an apocalyptic number.

20875968779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20875968779 is an equidigital number, since it uses as much as digits as its factorization.

20875968779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 106686720, while the sum is 68.

The spelling of 20875968779 in words is "twenty billion, eight hundred seventy-five million, nine hundred sixty-eight thousand, seven hundred seventy-nine".