18380744544 has 48 divisors (see below), whose sum is σ = 48629403648. Its totient is φ = 6078667392.

The previous prime is 18380744531. The next prime is 18380744579. The reversal of 18380744544 is 44544708381.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 18380744493 and 18380744502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741612 + ... + 765995.

It is an arithmetic number, because the mean of its divisors is an integer number (1013112576).

Almost surely, 2^18380744544 is an apocalyptic number.

It is an amenable number.

18380744544 is an abundant number, since it is smaller than the sum of its proper divisors (30248659104).

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

18380744544 is a wasteful number, since it uses less digits than its factorization.

18380744544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507747 (or 1507739 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 48.

The spelling of 18380744544 in words is "eighteen billion, three hundred eighty million, seven hundred forty-four thousand, five hundred forty-four".