18813746436 has 24 divisors (see below), whose sum is σ = 43932060480. Its totient is φ = 6266488992.

The previous prime is 18813746411. The next prime is 18813746449. The reversal of 18813746436 is 63464731881.

It is a happy 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, 578491 + ... + 610146.

It is an arithmetic number, because the mean of its divisors is an integer number (1830502520).

Almost surely, 2^18813746436 is an apocalyptic number.

It is an amenable number.

18813746436 is an abundant number, since it is smaller than the sum of its proper divisors (25118314044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18813746436 is a wasteful number, since it uses less digits than its factorization.

18813746436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189963 (or 1189961 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The spelling of 18813746436 in words is "eighteen billion, eight hundred thirteen million, seven hundred forty-six thousand, four hundred thirty-six".