18401743689840 has 120 divisors (see below), whose sum is σ = 70627644847968. Its totient is φ = 4206112842240.

The previous prime is 18401743689821. The next prime is 18401743689893. The reversal of 18401743689840 is 4898634710481.

18401743689840 is a `hidden beast` number, since 1 + 8 + 40 + 1 + 7 + 436 + 89 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 1825564771 + ... + 1825574850.

Almost surely, 2^{18401743689840} is an apocalyptic number.

18401743689840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18401743689840 is an abundant number, since it is smaller than the sum of its proper divisors (52225901158128).

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

18401743689840 is a wasteful number, since it uses less digits than its factorization.

18401743689840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651139647 (or 3651139638 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 63.

The spelling of 18401743689840 in words is "eighteen trillion, four hundred one billion, seven hundred forty-three million, six hundred eighty-nine thousand, eight hundred forty".