18018544894 has 24 divisors (see below), whose sum is σ = 31973422680. Its totient is φ = 7591345776.

The previous prime is 18018544891. The next prime is 18018544897. The reversal of 18018544894 is 49844581081.

It is an interprime number because it is at equal distance from previous prime (18018544891) and next prime (18018544897).

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018544891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1552377 + ... + 1563940.

It is an arithmetic number, because the mean of its divisors is an integer number (1332225945).

Almost surely, 2^18018544894 is an apocalyptic number.

18018544894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18018544894 is a deficient number, since it is larger than the sum of its proper divisors (13954877786).

18018544894 is a wasteful number, since it uses less digits than its factorization.

18018544894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116392 (or 3116385 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 52.

The spelling of 18018544894 in words is "eighteen billion, eighteen million, five hundred forty-four thousand, eight hundred ninety-four".