16690537 has 2 divisors, whose sum is σ = 16690538. Its totient is φ = 16690536.

The previous prime is 16690511. The next prime is 16690559. The reversal of 16690537 is 73509661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14561856 + 2128681 = 3816^2 + 1459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16690537 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16690496 and 16690505.

It is not a weakly prime, because it can be changed into another prime (16690507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345268 + 8345269.

It is an arithmetic number, because the mean of its divisors is an integer number (8345269).

Almost surely, 2^16690537 is an apocalyptic number.

It is an amenable number.

16690537 is a deficient number, since it is larger than the sum of its proper divisors (1).

16690537 is an equidigital number, since it uses as much as digits as its factorization.

16690537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 16690537 is about 4085.4053654442. The cubic root of 16690537 is about 255.5583663697.

The spelling of 16690537 in words is "sixteen million, six hundred ninety thousand, five hundred thirty-seven".