18115031854 has 4 divisors (see below), whose sum is σ = 27172547784. Its totient is φ = 9057515926.

The previous prime is 18115031839. The next prime is 18115031867. The reversal of 18115031854 is 45813051181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45813051181 = 22367 ⋅2048243.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4528757962 + ... + 4528757965.

It is an arithmetic number, because the mean of its divisors is an integer number (6793136946).

Almost surely, 2^18115031854 is an apocalyptic number.

18115031854 is a deficient number, since it is larger than the sum of its proper divisors (9057515930).

18115031854 is an equidigital number, since it uses as much as digits as its factorization.

18115031854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9057515929.

The product of its (nonzero) digits is 19200, while the sum is 37.

The spelling of 18115031854 in words is "eighteen billion, one hundred fifteen million, thirty-one thousand, eight hundred fifty-four".