18478678699 has 32 divisors (see below), whose sum is σ = 21162645504. Its totient is φ = 16004926080.

The previous prime is 18478678663. The next prime is 18478678711. The reversal of 18478678699 is 99687687481.

It is not a de Polignac number, because 18478678699 - 2³¹ = 16331195051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18478678619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8078734 + ... + 8081020.

It is an arithmetic number, because the mean of its divisors is an integer number (661332672).

Almost surely, 2^18478678699 is an apocalyptic number.

18478678699 is a deficient number, since it is larger than the sum of its proper divisors (2683966805).

18478678699 is a wasteful number, since it uses less digits than its factorization.

18478678699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827.

The product of its digits is 292626432, while the sum is 73.

The spelling of 18478678699 in words is "eighteen billion, four hundred seventy-eight million, six hundred seventy-eight thousand, six hundred ninety-nine".