18325232640 has 1056 divisors, whose sum is σ = 78111161856. Its totient is φ = 4060938240.

The previous prime is 18325232633. The next prime is 18325232659. The reversal of 18325232640 is 4623252381.

18325232640 is a `hidden beast` number, since 1 + 8 + 3 + 2 + 5 + 2 + 3 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (1056).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18325232595 and 18325232604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 177914829 + ... + 177914931.

Almost surely, 2^18325232640 is an apocalyptic number.

18325232640 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 18325232640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39055580928).

18325232640 is an abundant number, since it is smaller than the sum of its proper divisors (59785929216).

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

18325232640 is a wasteful number, since it uses less digits than its factorization.

18325232640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 18325232640 in words is "eighteen billion, three hundred twenty-five million, two hundred thirty-two thousand, six hundred forty".