18814256399 has 12 divisors (see below), whose sum is σ = 20104572600. Its totient is φ = 17557922448.

The previous prime is 18814256389. The next prime is 18814256401. The reversal of 18814256399 is 99365241881.

It is a de Polignac number, because none of the positive numbers 2^k-18814256399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814256309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25004 + ... + 195585.

It is an arithmetic number, because the mean of its divisors is an integer number (1675381050).

Almost surely, 2^18814256399 is an apocalyptic number.

18814256399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18814256399 is a deficient number, since it is larger than the sum of its proper divisors (1290316201).

18814256399 is an equidigital number, since it uses as much as digits as its factorization.

18814256399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220742 (or 220675 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The spelling of 18814256399 in words is "eighteen billion, eight hundred fourteen million, two hundred fifty-six thousand, three hundred ninety-nine".