18378457944 has 64 divisors (see below), whose sum is σ = 57283511040. Its totient is φ = 4773624960.

The previous prime is 18378457943. The next prime is 18378457949. The reversal of 18378457944 is 44975487381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378457943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4970679 + ... + 4974374.

It is an arithmetic number, because the mean of its divisors is an integer number (895054860).

Almost surely, 2^18378457944 is an apocalyptic number.

18378457944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18378457944 is an abundant number, since it is smaller than the sum of its proper divisors (38905053096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18378457944 is a wasteful number, since it uses less digits than its factorization.

18378457944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945080 (or 9945076 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The spelling of 18378457944 in words is "eighteen billion, three hundred seventy-eight million, four hundred fifty-seven thousand, nine hundred forty-four".