18381729999672 has 96 divisors (see below), whose sum is σ = 53614861088880. Its totient is φ = 5655760588800.

The previous prime is 18381729999643. The next prime is 18381729999733. The reversal of 18381729999672 is 27699992718381.

18381729999672 is a `hidden beast` number, since 1 + 8 + 381 + 7 + 2 + 99 + 99 + 67 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18381729999591 and 18381729999600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36230547 + ... + 36734397.

Almost surely, 2^{18381729999672} is an apocalyptic number.

18381729999672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18381729999672 is an abundant number, since it is smaller than the sum of its proper divisors (35233131089208).

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

18381729999672 is a wasteful number, since it uses less digits than its factorization.

18381729999672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542853 (or 542846 counting only the distinct ones).

The product of its digits is 1481421312, while the sum is 81.

The spelling of 18381729999672 in words is "eighteen trillion, three hundred eighty-one billion, seven hundred twenty-nine million, nine hundred ninety-nine thousand, six hundred seventy-two".