16640999 has 2 divisors, whose sum is σ = 16641000. Its totient is φ = 16640998.

The previous prime is 16640969. The next prime is 16641019. The reversal of 16640999 is 99904661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16640999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16640969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320499 + 8320500.

It is an arithmetic number, because the mean of its divisors is an integer number (8320500).

Almost surely, 2^16640999 is an apocalyptic number.

16640999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16640999 is an equidigital number, since it uses as much as digits as its factorization.

16640999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 16640999 is about 4079.3380590483. The cubic root of 16640999 is about 255.3052809241.

The spelling of 16640999 in words is "sixteen million, six hundred forty thousand, nine hundred ninety-nine".