16557199 has 2 divisors, whose sum is σ = 16557200. Its totient is φ = 16557198.

The previous prime is 16557197. The next prime is 16557223. The reversal of 16557199 is 99175561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16557199 - 2¹ = 16557197 is a prime.

Together with 16557197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16557197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278599 + 8278600.

It is an arithmetic number, because the mean of its divisors is an integer number (8278600).

Almost surely, 2^16557199 is an apocalyptic number.

16557199 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557199 is an equidigital number, since it uses as much as digits as its factorization.

16557199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85050, while the sum is 43.

The square root of 16557199 is about 4069.0538212218. The cubic root of 16557199 is about 254.8760078983.

The spelling of 16557199 in words is "sixteen million, five hundred fifty-seven thousand, one hundred ninety-nine".