16648999 has 2 divisors, whose sum is σ = 16649000. Its totient is φ = 16648998.

The previous prime is 16648991. The next prime is 16649011. The reversal of 16648999 is 99984661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16648999 - 2³ = 16648991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16648991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324499 + 8324500.

It is an arithmetic number, because the mean of its divisors is an integer number (8324500).

Almost surely, 2^16648999 is an apocalyptic number.

16648999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16648999 is an equidigital number, since it uses as much as digits as its factorization.

16648999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 16648999 is about 4080.3184924709. The cubic root of 16648999 is about 255.3461862215.

It can be divided in two parts, 166489 and 99, that multiplied together give a triangular number (16482411 = T₅₇₄₁).

The spelling of 16648999 in words is "sixteen million, six hundred forty-eight thousand, nine hundred ninety-nine".