115218725891 has 8 divisors (see below), whose sum is σ = 117675727680. Its totient is φ = 112761955008.

The previous prime is 115218725863. The next prime is 115218725917. The reversal of 115218725891 is 198527812511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115218725891 - 2⁶ = 115218725827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115218725801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275575 + ... + 1362911.

It is an arithmetic number, because the mean of its divisors is an integer number (14709465960).

Almost surely, 2^115218725891 is an apocalyptic number.

115218725891 is a deficient number, since it is larger than the sum of its proper divisors (2457001789).

115218725891 is an equidigital number, since it uses as much as digits as its factorization.

115218725891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115453.

The product of its digits is 403200, while the sum is 50.

The spelling of 115218725891 in words is "one hundred fifteen billion, two hundred eighteen million, seven hundred twenty-five thousand, eight hundred ninety-one".