16990657 has 2 divisors, whose sum is σ = 16990658. Its totient is φ = 16990656.

The previous prime is 16990639. The next prime is 16990663. The reversal of 16990657 is 75609961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 3418801 = 3684^2 + 1849^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990657 - 2²³ = 8602049 is a prime.

It is not a weakly prime, because it can be changed into another prime (16990357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495328 + 8495329.

It is an arithmetic number, because the mean of its divisors is an integer number (8495329).

Almost surely, 2^16990657 is an apocalyptic number.

It is an amenable number.

16990657 is a deficient number, since it is larger than the sum of its proper divisors (1).

16990657 is an equidigital number, since it uses as much as digits as its factorization.

16990657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 16990657 is about 4121.9724647309. The cubic root of 16990657 is about 257.0810455634.

The spelling of 16990657 in words is "sixteen million, nine hundred ninety thousand, six hundred fifty-seven".