16669890091 has 2 divisors, whose sum is σ = 16669890092. Its totient is φ = 16669890090.

The previous prime is 16669890077. The next prime is 16669890119. The reversal of 16669890091 is 19009896661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16669890091 - 2⁷ = 16669889963 is a prime.

It is not a weakly prime, because it can be changed into another prime (16669890191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334945045 + 8334945046.

It is an arithmetic number, because the mean of its divisors is an integer number (8334945046).

Almost surely, 2^16669890091 is an apocalyptic number.

16669890091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16669890091 is an equidigital number, since it uses as much as digits as its factorization.

16669890091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 16669890091 in words is "sixteen billion, six hundred sixty-nine million, eight hundred ninety thousand, ninety-one".