18401666840 has 16 divisors (see below), whose sum is σ = 41403750480. Its totient is φ = 7360666720.

The previous prime is 18401666837. The next prime is 18401666849. The reversal of 18401666840 is 4866610481.

It is a junction number, because it is equal to n+sod(n) for n = 18401666791 and 18401666800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401666849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230020796 + ... + 230020875.

It is an arithmetic number, because the mean of its divisors is an integer number (2587734405).

Almost surely, 2^18401666840 is an apocalyptic number.

18401666840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18401666840 is an abundant number, since it is smaller than the sum of its proper divisors (23002083640).

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

18401666840 is a wasteful number, since it uses less digits than its factorization.

18401666840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460041682 (or 460041678 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 18401666840 in words is "eighteen billion, four hundred one million, six hundred sixty-six thousand, eight hundred forty".