18344966640 has 640 divisors, whose sum is σ = 80394854400. Its totient is φ = 3332689920.

The previous prime is 18344966639. The next prime is 18344966657. The reversal of 18344966640 is 4666944381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4562551 + ... + 4566569.

It is an arithmetic number, because the mean of its divisors is an integer number (125616960).

Almost surely, 2^18344966640 is an apocalyptic number.

18344966640 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 18344966640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40197427200).

18344966640 is an abundant number, since it is smaller than the sum of its proper divisors (62049887760).

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

18344966640 is a wasteful number, since it uses less digits than its factorization.

18344966640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085 (or 4079 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 18344966640 in words is "eighteen billion, three hundred forty-four million, nine hundred sixty-six thousand, six hundred forty".