18936715894 has 8 divisors (see below), whose sum is σ = 28472867640. Its totient is φ = 9445760016.

The previous prime is 18936715813. The next prime is 18936715957. The reversal of 18936715894 is 49851763981.

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

It is a congruent number.

It is an unprimeable number.

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, 11297919 + ... + 11299594.

It is an arithmetic number, because the mean of its divisors is an integer number (3559108455).

Almost surely, 2^18936715894 is an apocalyptic number.

18936715894 is a deficient number, since it is larger than the sum of its proper divisors (9536151746).

18936715894 is a wasteful number, since it uses less digits than its factorization.

18936715894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22597934.

The product of its digits is 13063680, while the sum is 61.

The spelling of 18936715894 in words is "eighteen billion, nine hundred thirty-six million, seven hundred fifteen thousand, eight hundred ninety-four".