18915943396 has 12 divisors (see below), whose sum is σ = 37831886848. Its totient is φ = 8106832872.

The previous prime is 18915943379. The next prime is 18915943399. The reversal of 18915943396 is 69334951981.

It is a happy number.

18915943396 is an admirable number.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18915943396.

It is not an unprimeable number, because it can be changed into a prime (18915943399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337784676 + ... + 337784731.

Almost surely, 2^18915943396 is an apocalyptic number.

It is an amenable number.

18915943396 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18915943396 is a wasteful number, since it uses less digits than its factorization.

18915943396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675569418 (or 675569416 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 58.

The spelling of 18915943396 in words is "eighteen billion, nine hundred fifteen million, nine hundred forty-three thousand, three hundred ninety-six".