18115943694 has 8 divisors (see below), whose sum is σ = 36231887400. Its totient is φ = 6038647896.

The previous prime is 18115943693. The next prime is 18115943719. The reversal of 18115943694 is 49634951181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

18115943694 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115943693) 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, 1509661969 + ... + 1509661980.

It is an arithmetic number, because the mean of its divisors is an integer number (4528985925).

Almost surely, 2^18115943694 is an apocalyptic number.

18115943694 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.

18115943694 is a wasteful number, since it uses less digits than its factorization.

18115943694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019323954.

The product of its digits is 933120, while the sum is 51.

The spelling of 18115943694 in words is "eighteen billion, one hundred fifteen million, nine hundred forty-three thousand, six hundred ninety-four".