115638845868 has 144 divisors (see below), whose sum is σ = 363328370496. Its totient is φ = 30196108800.

The previous prime is 115638845843. The next prime is 115638845899. The reversal of 115638845868 is 868548836511.

115638845868 is a `hidden beast` number, since 1 + 1 + 563 + 8 + 8 + 4 + 5 + 8 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156130 + ... + 505622.

It is an arithmetic number, because the mean of its divisors is an integer number (2523113684).

Almost surely, 2^115638845868 is an apocalyptic number.

115638845868 is a gapful number since it is divisible by the number (18) 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 115638845868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181664185248).

115638845868 is an abundant number, since it is smaller than the sum of its proper divisors (247689524628).

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

115638845868 is a wasteful number, since it uses less digits than its factorization.

115638845868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349624 (or 349619 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 63.

The spelling of 115638845868 in words is "one hundred fifteen billion, six hundred thirty-eight million, eight hundred forty-five thousand, eight hundred sixty-eight".