18505015505 has 8 divisors (see below), whose sum is σ = 22211763624. Its totient is φ = 14800182400.

The previous prime is 18505015489. The next prime is 18505015511. The reversal of 18505015505 is 50551050581.

It can be written as a sum of positive squares in 4 ways, for example, as 38416 + 18504977089 = 196^2 + 136033^2 .

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

It is not a de Polignac number, because 18505015505 - 2⁴ = 18505015489 is a prime.

It is a Duffinian number.

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, 457406 + ... + 496215.

It is an arithmetic number, because the mean of its divisors is an integer number (2776470453).

Almost surely, 2^18505015505 is an apocalyptic number.

It is an amenable number.

18505015505 is a deficient number, since it is larger than the sum of its proper divisors (3706748119).

18505015505 is an equidigital number, since it uses as much as digits as its factorization.

18505015505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957507.

The product of its (nonzero) digits is 25000, while the sum is 35.

The spelling of 18505015505 in words is "eighteen billion, five hundred five million, fifteen thousand, five hundred five".