118321643520 has 408 divisors, whose sum is σ = 418469857416. Its totient is φ = 30916214784.

The previous prime is 118321643501. The next prime is 118321643533. The reversal of 118321643520 is 25346123811.

118321643520 is a `hidden beast` number, since 1 + 1 + 8 + 3 + 2 + 1 + 643 + 5 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26759725056 + 91561918464 = 163584^2 + 302592^2 .

It is a super-2 number, since 2×118321643520² (a number of 23 digits) contains 22 as substring.

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

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, 156302982 + ... + 156303738.

Almost surely, 2^118321643520 is an apocalyptic number.

118321643520 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 118321643520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209234928708).

118321643520 is an abundant number, since it is smaller than the sum of its proper divisors (300148213896).

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

118321643520 is an frugal number, since it uses more digits than its factorization.

118321643520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 118321643520 in words is "one hundred eighteen billion, three hundred twenty-one million, six hundred forty-three thousand, five hundred twenty".