18380716640 has 192 divisors, whose sum is σ = 51255348480. Its totient is φ = 6140835840.

The previous prime is 18380716637. The next prime is 18380716663. The reversal of 18380716640 is 4661708381.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 18380716591 and 18380716600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5191991 + ... + 5195529.

It is an arithmetic number, because the mean of its divisors is an integer number (266954940).

Almost surely, 2^18380716640 is an apocalyptic number.

18380716640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18380716640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25627674240).

18380716640 is an abundant number, since it is smaller than the sum of its proper divisors (32874631840).

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

18380716640 is a wasteful number, since it uses less digits than its factorization.

18380716640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805 (or 3797 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 18380716640 in words is "eighteen billion, three hundred eighty million, seven hundred sixteen thousand, six hundred forty".