18417690943 has 4 divisors (see below), whose sum is σ = 18484181080. Its totient is φ = 18351200808.

The previous prime is 18417690937. The next prime is 18417690961. The reversal of 18417690943 is 34909671481.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18417690943 is a prime.

It is a super-2 number, since 2×18417690943² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18417690743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33244653 + ... + 33245206.

It is an arithmetic number, because the mean of its divisors is an integer number (4621045270).

Almost surely, 2^18417690943 is an apocalyptic number.

18417690943 is a deficient number, since it is larger than the sum of its proper divisors (66490137).

18417690943 is an equidigital number, since it uses as much as digits as its factorization.

18417690943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66490136.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 18417690943 in words is "eighteen billion, four hundred seventeen million, six hundred ninety thousand, nine hundred forty-three".