16499807999 has 4 divisors (see below), whose sum is σ = 16501566960. Its totient is φ = 16498049040.

The previous prime is 16499807971. The next prime is 16499808019. The reversal of 16499807999 is 99970899461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99970899461 = 41 ⋅2438314621.

It is a cyclic number.

It is not a de Polignac number, because 16499807999 - 2⁸ = 16499807743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16499809999) 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, 865334 + ... + 884195.

It is an arithmetic number, because the mean of its divisors is an integer number (4125391740).

Almost surely, 2^16499807999 is an apocalyptic number.

16499807999 is a deficient number, since it is larger than the sum of its proper divisors (1758961).

16499807999 is an equidigital number, since it uses as much as digits as its factorization.

16499807999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758960.

The product of its (nonzero) digits is 79361856, while the sum is 71.

The spelling of 16499807999 in words is "sixteen billion, four hundred ninety-nine million, eight hundred seven thousand, nine hundred ninety-nine".