18764181444 has 48 divisors (see below), whose sum is σ = 44085577536. Its totient is φ = 6211632000.

The previous prime is 18764181437. The next prime is 18764181463. The reversal of 18764181444 is 44418146781.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18764181393 and 18764181402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342894 + ... + 1356794.

It is an arithmetic number, because the mean of its divisors is an integer number (918449532).

Almost surely, 2^18764181444 is an apocalyptic number.

It is an amenable number.

18764181444 is an abundant number, since it is smaller than the sum of its proper divisors (25321396092).

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

18764181444 is a wasteful number, since it uses less digits than its factorization.

18764181444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14676 (or 14674 counting only the distinct ones).

The product of its digits is 688128, while the sum is 48.

The spelling of 18764181444 in words is "eighteen billion, seven hundred sixty-four million, one hundred eighty-one thousand, four hundred forty-four".