16986772091 has 2 divisors, whose sum is σ = 16986772092. Its totient is φ = 16986772090.

The previous prime is 16986772087. The next prime is 16986772093. The reversal of 16986772091 is 19027768961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16986772091 - 2² = 16986772087 is a prime.

Together with 16986772093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16986772093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8493386045 + 8493386046.

It is an arithmetic number, because the mean of its divisors is an integer number (8493386046).

Almost surely, 2^16986772091 is an apocalyptic number.

16986772091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16986772091 is an equidigital number, since it uses as much as digits as its factorization.

16986772091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 16986772091 in words is "sixteen billion, nine hundred eighty-six million, seven hundred seventy-two thousand, ninety-one".