18912309708 has 24 divisors (see below), whose sum is σ = 45154973248. Its totient is φ = 6157496016.

The previous prime is 18912309707. The next prime is 18912309733. The reversal of 18912309708 is 80790321981.

It is a super-2 number, since 2×18912309708² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18912309707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18325366 + ... + 18326397.

Almost surely, 2^18912309708 is an apocalyptic number.

It is an amenable number.

18912309708 is an abundant number, since it is smaller than the sum of its proper divisors (26242663540).

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

18912309708 is a wasteful number, since it uses less digits than its factorization.

18912309708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36651813 (or 36651811 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 18912309708 in words is "eighteen billion, nine hundred twelve million, three hundred nine thousand, seven hundred eight".