16691651 has 2 divisors, whose sum is σ = 16691652. Its totient is φ = 16691650.

The previous prime is 16691621. The next prime is 16691657. The reversal of 16691651 is 15619661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16691651 - 2¹⁰ = 16690627 is a prime.

It is a super-2 number, since 2×16691651² = 557222426211602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16691657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345825 + 8345826.

It is an arithmetic number, because the mean of its divisors is an integer number (8345826).

Almost surely, 2^16691651 is an apocalyptic number.

16691651 is a deficient number, since it is larger than the sum of its proper divisors (1).

16691651 is an equidigital number, since it uses as much as digits as its factorization.

16691651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 16691651 is about 4085.5417021492. The cubic root of 16691651 is about 255.5640519404.

The spelling of 16691651 in words is "sixteen million, six hundred ninety-one thousand, six hundred fifty-one".