18215436804 has 12 divisors (see below), whose sum is σ = 42502685904. Its totient is φ = 6071812264.

The previous prime is 18215436739. The next prime is 18215436817. The reversal of 18215436804 is 40863451281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758976522 + ... + 758976545.

It is an arithmetic number, because the mean of its divisors is an integer number (3541890492).

Almost surely, 2^18215436804 is an apocalyptic number.

It is an amenable number.

18215436804 is an abundant number, since it is smaller than the sum of its proper divisors (24287249100).

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

18215436804 is a wasteful number, since it uses less digits than its factorization.

18215436804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517953074 (or 1517953072 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 18215436804 in words is "eighteen billion, two hundred fifteen million, four hundred thirty-six thousand, eight hundred four".