18612817986808 has 8 divisors (see below), whose sum is σ = 34899033725280. Its totient is φ = 9306408993400.

The previous prime is 18612817986713. The next prime is 18612817986817. The reversal of 18612817986808 is 80868971821681.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1163301124168 + ... + 1163301124183.

It is an arithmetic number, because the mean of its divisors is an integer number (4362379215660).

Almost surely, 2^{18612817986808} is an apocalyptic number.

It is an amenable number.

18612817986808 is a deficient number, since it is larger than the sum of its proper divisors (16286215738472).

18612817986808 is a wasteful number, since it uses less digits than its factorization.

18612817986808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326602248357 (or 2326602248353 counting only the distinct ones).

The product of its (nonzero) digits is 148635648, while the sum is 73.

The spelling of 18612817986808 in words is "eighteen trillion, six hundred twelve billion, eight hundred seventeen million, nine hundred eighty-six thousand, eight hundred eight".