17990192809 has 4 divisors (see below), whose sum is σ = 17991895680. Its totient is φ = 17988489940.

The previous prime is 17990192797. The next prime is 17990192819. The reversal of 17990192809 is 90829109971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17990192809 - 2⁵ = 17990192777 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 17990192809.

It is not an unprimeable number, because it can be changed into a prime (17990192819) 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, 835489 + ... + 856750.

It is an arithmetic number, because the mean of its divisors is an integer number (4497973920).

Almost surely, 2^17990192809 is an apocalyptic number.

It is an amenable number.

17990192809 is a deficient number, since it is larger than the sum of its proper divisors (1702871).

17990192809 is a wasteful number, since it uses less digits than its factorization.

17990192809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702870.

The product of its (nonzero) digits is 734832, while the sum is 55.

It can be divided in two parts, 17990192 and 809, that added together give a triangular number (17991001 = T₅₉₉₈).

The spelling of 17990192809 in words is "seventeen billion, nine hundred ninety million, one hundred ninety-two thousand, eight hundred nine".