115449725721 has 16 divisors (see below), whose sum is σ = 171499788288. Its totient is φ = 68480816400.

The previous prime is 115449725719. The next prime is 115449725723. The reversal of 115449725721 is 127527944511.

It is an interprime number because it is at equal distance from previous prime (115449725719) and next prime (115449725723).

It is not a de Polignac number, because 115449725721 - 2¹ = 115449725719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115449725723) 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 15 ways as a sum of consecutive naturals, for example, 37216285 + ... + 37219386.

It is an arithmetic number, because the mean of its divisors is an integer number (10718736768).

Almost surely, 2^115449725721 is an apocalyptic number.

115449725721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115449725721 is a deficient number, since it is larger than the sum of its proper divisors (56050062567).

115449725721 is a wasteful number, since it uses less digits than its factorization.

115449725721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74435732.

The product of its digits is 705600, while the sum is 48.

The spelling of 115449725721 in words is "one hundred fifteen billion, four hundred forty-nine million, seven hundred twenty-five thousand, seven hundred twenty-one".