20968676591 has 2 divisors, whose sum is σ = 20968676592. Its totient is φ = 20968676590.

The previous prime is 20968676587. The next prime is 20968676609. The reversal of 20968676591 is 19567686902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20968676591 - 2² = 20968676587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20968676591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20968676191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484338295 + 10484338296.

It is an arithmetic number, because the mean of its divisors is an integer number (10484338296).

Almost surely, 2^20968676591 is an apocalyptic number.

20968676591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20968676591 is an equidigital number, since it uses as much as digits as its factorization.

20968676591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 20968676591 in words is "twenty billion, nine hundred sixty-eight million, six hundred seventy-six thousand, five hundred ninety-one".