18924505865 has 16 divisors (see below), whose sum is σ = 22827237888. Its totient is φ = 15061147776.

The previous prime is 18924505819. The next prime is 18924505879. The reversal of 18924505865 is 56850542981.

It is a cyclic number.

It is not a de Polignac number, because 18924505865 - 2²⁴ = 18907728649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1842434 + ... + 1852676.

It is an arithmetic number, because the mean of its divisors is an integer number (1426702368).

Almost surely, 2^18924505865 is an apocalyptic number.

It is an amenable number.

18924505865 is a deficient number, since it is larger than the sum of its proper divisors (3902732023).

18924505865 is a wasteful number, since it uses less digits than its factorization.

18924505865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12128.

The product of its (nonzero) digits is 3456000, while the sum is 53.

The spelling of 18924505865 in words is "eighteen billion, nine hundred twenty-four million, five hundred five thousand, eight hundred sixty-five".