18722400008 has 24 divisors (see below), whose sum is σ = 38012567850. Its totient is φ = 8641107072.

The previous prime is 18722399981. The next prime is 18722400013. The reversal of 18722400008 is 80000422781.

It can be written as a sum of positive squares in 3 ways, for example, as 11432314084 + 7290085924 = 106922^2 + 85382^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6922613 + ... + 6925316.

Almost surely, 2^18722400008 is an apocalyptic number.

It is an amenable number.

18722400008 is an abundant number, since it is smaller than the sum of its proper divisors (19290167842).

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

18722400008 is a wasteful number, since it uses less digits than its factorization.

18722400008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13847961 (or 13847944 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

Adding to 18722400008 its reverse (80000422781), we get a palindrome (98722822789).

The spelling of 18722400008 in words is "eighteen billion, seven hundred twenty-two million, four hundred thousand, eight".