18001991314 has 4 divisors (see below), whose sum is σ = 27002986974. Its totient is φ = 9000995656.

The previous prime is 18001991281. The next prime is 18001991321. The reversal of 18001991314 is 41319910081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14758119289 + 3243872025 = 121483^2 + 56955^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500497827 + ... + 4500497830.

Almost surely, 2^18001991314 is an apocalyptic number.

18001991314 is a deficient number, since it is larger than the sum of its proper divisors (9000995660).

18001991314 is an equidigital number, since it uses as much as digits as its factorization.

18001991314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000995659.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 18001991314 in words is "eighteen billion, one million, nine hundred ninety-one thousand, three hundred fourteen".