18715718573 has 4 divisors (see below), whose sum is σ = 18820275840. Its totient is φ = 18611161308.

The previous prime is 18715718533. The next prime is 18715718579. The reversal of 18715718573 is 37581751781.

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 18715718573 - 2⁶ = 18715718509 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 (18715718579) 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, 52278365 + ... + 52278722.

It is an arithmetic number, because the mean of its divisors is an integer number (4705068960).

Almost surely, 2^18715718573 is an apocalyptic number.

It is an amenable number.

18715718573 is a deficient number, since it is larger than the sum of its proper divisors (104557267).

18715718573 is a wasteful number, since it uses less digits than its factorization.

18715718573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104557266.

The product of its digits is 1646400, while the sum is 53.

The spelling of 18715718573 in words is "eighteen billion, seven hundred fifteen million, seven hundred eighteen thousand, five hundred seventy-three".