16599881 has 2 divisors, whose sum is σ = 16599882. Its totient is φ = 16599880.

The previous prime is 16599857. The next prime is 16599889. The reversal of 16599881 is 18899561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 116281 = 4060^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 16599881 - 2²² = 12405577 is a prime.

It is a super-2 number, since 2×16599881² = 551112098428322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16599889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8299940 + 8299941.

It is an arithmetic number, because the mean of its divisors is an integer number (8299941).

Almost surely, 2^16599881 is an apocalyptic number.

It is an amenable number.

16599881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16599881 is an equidigital number, since it uses as much as digits as its factorization.

16599881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 47.

The square root of 16599881 is about 4074.2951537659. The cubic root of 16599881 is about 255.0948308066.

The spelling of 16599881 in words is "sixteen million, five hundred ninety-nine thousand, eight hundred eighty-one".