20967537791 has 2 divisors, whose sum is σ = 20967537792. Its totient is φ = 20967537790.

The previous prime is 20967537737. The next prime is 20967537793. The reversal of 20967537791 is 19773576902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20967537791 - 2⁶ = 20967537727 is a prime.

Together with 20967537793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967537793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483768895 + 10483768896.

It is an arithmetic number, because the mean of its divisors is an integer number (10483768896).

Almost surely, 2^20967537791 is an apocalyptic number.

20967537791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967537791 is an equidigital number, since it uses as much as digits as its factorization.

20967537791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000940, while the sum is 56.

The spelling of 20967537791 in words is "twenty billion, nine hundred sixty-seven million, five hundred thirty-seven thousand, seven hundred ninety-one".