18591090994 has 8 divisors (see below), whose sum is σ = 31870441728. Its totient is φ = 7967610420.

The previous prime is 18591090971. The next prime is 18591090997. The reversal of 18591090994 is 49909019581.

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

It is not an unprimeable number, because it can be changed into a prime (18591090997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663967522 + ... + 663967549.

It is an arithmetic number, because the mean of its divisors is an integer number (3983805216).

Almost surely, 2^18591090994 is an apocalyptic number.

18591090994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18591090994 is a deficient number, since it is larger than the sum of its proper divisors (13279350734).

18591090994 is a wasteful number, since it uses less digits than its factorization.

18591090994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327935080.

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 18591090994 in words is "eighteen billion, five hundred ninety-one million, ninety thousand, nine hundred ninety-four".