16653491 has 2 divisors, whose sum is σ = 16653492. Its totient is φ = 16653490.

The previous prime is 16653487. The next prime is 16653493. The reversal of 16653491 is 19435661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16653491 - 2² = 16653487 is a prime.

Together with 16653493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16653493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8326745 + 8326746.

It is an arithmetic number, because the mean of its divisors is an integer number (8326746).

Almost surely, 2^16653491 is an apocalyptic number.

16653491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16653491 is an equidigital number, since it uses as much as digits as its factorization.

16653491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 16653491 is about 4080.8689025745. The cubic root of 16653491 is about 255.3691488018.

The spelling of 16653491 in words is "sixteen million, six hundred fifty-three thousand, four hundred ninety-one".