16568974091 has 2 divisors, whose sum is σ = 16568974092. Its totient is φ = 16568974090.

The previous prime is 16568974087. The next prime is 16568974153. The reversal of 16568974091 is 19047986561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16568974091 - 2² = 16568974087 is a prime.

It is not a weakly prime, because it can be changed into another prime (16567974091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8284487045 + 8284487046.

It is an arithmetic number, because the mean of its divisors is an integer number (8284487046).

Almost surely, 2^16568974091 is an apocalyptic number.

16568974091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16568974091 is an equidigital number, since it uses as much as digits as its factorization.

16568974091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 16568974091 in words is "sixteen billion, five hundred sixty-eight million, nine hundred seventy-four thousand, ninety-one".