18918174463 has 4 divisors (see below), whose sum is σ = 18993545928. Its totient is φ = 18842803000.

The previous prime is 18918174461. The next prime is 18918174469. The reversal of 18918174463 is 36447181981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18918174463 - 2¹ = 18918174461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18918174463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918174461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37685356 + ... + 37685857.

It is an arithmetic number, because the mean of its divisors is an integer number (4748386482).

Almost surely, 2^18918174463 is an apocalyptic number.

18918174463 is a deficient number, since it is larger than the sum of its proper divisors (75371465).

18918174463 is an equidigital number, since it uses as much as digits as its factorization.

18918174463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75371464.

The product of its digits is 1161216, while the sum is 52.

The spelling of 18918174463 in words is "eighteen billion, nine hundred eighteen million, one hundred seventy-four thousand, four hundred sixty-three".