16404800491 has 4 divisors (see below), whose sum is σ = 16451806000. Its totient is φ = 16357794984.

The previous prime is 16404800479. The next prime is 16404800497. The reversal of 16404800491 is 19400840461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16404800491 - 2⁵ = 16404800459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16404800491.

It is not an unprimeable number, because it can be changed into a prime (16404800497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23502231 + ... + 23502928.

It is an arithmetic number, because the mean of its divisors is an integer number (4112951500).

Almost surely, 2^16404800491 is an apocalyptic number.

16404800491 is a deficient number, since it is larger than the sum of its proper divisors (47005509).

16404800491 is an equidigital number, since it uses as much as digits as its factorization.

16404800491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47005508.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 16404800491 in words is "sixteen billion, four hundred four million, eight hundred thousand, four hundred ninety-one".