115755091985 has 32 divisors (see below), whose sum is σ = 151543532448. Its totient is φ = 84371374080.

The previous prime is 115755091981. The next prime is 115755091987. The reversal of 115755091985 is 589190557511.

It is a Cunningham number, because it is equal to 340228²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 87466879504 + 28288212481 = 295748^2 + 168191^2 .

It is not a de Polignac number, because 115755091985 - 2² = 115755091981 is a prime.

It is a super-2 number, since 2×115755091985² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115755091985.

It is not an unprimeable number, because it can be changed into a prime (115755091981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1737449 + ... + 1802841.

It is an arithmetic number, because the mean of its divisors is an integer number (4735735389).

Almost surely, 2^115755091985 is an apocalyptic number.

It is an amenable number.

115755091985 is a deficient number, since it is larger than the sum of its proper divisors (35788440463).

115755091985 is a wasteful number, since it uses less digits than its factorization.

115755091985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65765.

The product of its (nonzero) digits is 2835000, while the sum is 56.

The spelling of 115755091985 in words is "one hundred fifteen billion, seven hundred fifty-five million, ninety-one thousand, nine hundred eighty-five".