16690657 has 2 divisors, whose sum is σ = 16690658. Its totient is φ = 16690656.

The previous prime is 16690633. The next prime is 16690673. The reversal of 16690657 is 75609661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10732176 + 5958481 = 3276^2 + 2441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16690657 is a prime.

It is not a weakly prime, because it can be changed into another prime (16690627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345328 + 8345329.

It is an arithmetic number, because the mean of its divisors is an integer number (8345329).

Almost surely, 2^16690657 is an apocalyptic number.

It is an amenable number.

16690657 is a deficient number, since it is larger than the sum of its proper divisors (1).

16690657 is an equidigital number, since it uses as much as digits as its factorization.

16690657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 16690657 is about 4085.4200518429. The cubic root of 16690657 is about 255.5589788311.

The spelling of 16690657 in words is "sixteen million, six hundred ninety thousand, six hundred fifty-seven".