18504573789 has 16 divisors (see below), whose sum is σ = 26575959872. Its totient is φ = 11385163008.

The previous prime is 18504573781. The next prime is 18504573799. The reversal of 18504573789 is 98737540581.

It is a happy number.

It is not a de Polignac number, because 18504573789 - 2³ = 18504573781 is a prime.

It is a super-2 number, since 2×18504573789² (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 (18504573781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163029 + ... + 252165.

It is an arithmetic number, because the mean of its divisors is an integer number (1660997492).

Almost surely, 2^18504573789 is an apocalyptic number.

It is an amenable number.

18504573789 is a deficient number, since it is larger than the sum of its proper divisors (8071386083).

18504573789 is a wasteful number, since it uses less digits than its factorization.

18504573789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94476.

The product of its (nonzero) digits is 8467200, while the sum is 57.

The spelling of 18504573789 in words is "eighteen billion, five hundred four million, five hundred seventy-three thousand, seven hundred eighty-nine".