18438464708 has 24 divisors (see below), whose sum is σ = 33149737152. Its totient is φ = 8967266784.

The previous prime is 18438464701. The next prime is 18438464711. The reversal of 18438464708 is 80746483481.

It is a self number, because there is not a number n which added to its sum of digits gives 18438464708.

It is not an unprimeable number, because it can be changed into a prime (18438464701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504335 + ... + 539657.

It is an arithmetic number, because the mean of its divisors is an integer number (1381239048).

Almost surely, 2^18438464708 is an apocalyptic number.

It is an amenable number.

18438464708 is a deficient number, since it is larger than the sum of its proper divisors (14711272444).

18438464708 is a wasteful number, since it uses less digits than its factorization.

18438464708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38891 (or 38889 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 53.

The spelling of 18438464708 in words is "eighteen billion, four hundred thirty-eight million, four hundred sixty-four thousand, seven hundred eight".