118231643520 has 1280 divisors, whose sum is σ = 492653145600. Its totient is φ = 26802192384.

The previous prime is 118231643513. The next prime is 118231643527. The reversal of 118231643520 is 25346132811.

118231643520 is a `hidden beast` number, since 1 + 1 + 8 + 2 + 3 + 1 + 643 + 5 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (118231643513) and next prime (118231643527).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118231643527) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 385119207 + ... + 385119513.

It is an arithmetic number, because the mean of its divisors is an integer number (384885270).

Almost surely, 2^118231643520 is an apocalyptic number.

118231643520 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 118231643520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246326572800).

118231643520 is an abundant number, since it is smaller than the sum of its proper divisors (374421502080).

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

118231643520 is a wasteful number, since it uses less digits than its factorization.

118231643520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 376 counting only the distinct ones).

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

The spelling of 118231643520 in words is "one hundred eighteen billion, two hundred thirty-one million, six hundred forty-three thousand, five hundred twenty".