18261393708 has 12 divisors (see below), whose sum is σ = 42609918680. Its totient is φ = 6087131232.

The previous prime is 18261393707. The next prime is 18261393737. The reversal of 18261393708 is 80739316281.

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

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18261393707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760891393 + ... + 760891416.

Almost surely, 2^18261393708 is an apocalyptic number.

It is an amenable number.

18261393708 is an abundant number, since it is smaller than the sum of its proper divisors (24348524972).

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

18261393708 is a wasteful number, since it uses less digits than its factorization.

18261393708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521782816 (or 1521782814 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 18261393708 in words is "eighteen billion, two hundred sixty-one million, three hundred ninety-three thousand, seven hundred eight".