18505000555 has 8 divisors (see below), whose sum is σ = 22206879792. Its totient is φ = 14803414368.

The previous prime is 18505000537. The next prime is 18505000573. The reversal of 18505000555 is 55500050581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18505000537) and next prime (18505000573).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18505000555 - 2²⁷ = 18370782827 is a prime.

It is a super-3 number, since 3×18505000555³ (a number of 32 digits) contains 333 as substring.

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 18505000555.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105177 + ... + 219253.

It is an arithmetic number, because the mean of its divisors is an integer number (2775859974).

Almost surely, 2^18505000555 is an apocalyptic number.

18505000555 is a deficient number, since it is larger than the sum of its proper divisors (3701879237).

18505000555 is a wasteful number, since it uses less digits than its factorization.

18505000555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146525.

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 18505000555 in words is "eighteen billion, five hundred five million, five hundred fifty-five", and thus it is an aban number.