115851081785 has 4 divisors (see below), whose sum is σ = 139021298148. Its totient is φ = 92680865424.

The previous prime is 115851081769. The next prime is 115851081809. The reversal of 115851081785 is 587180158511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80186381584 + 35664700201 = 283172^2 + 188851^2 .

It is a cyclic number.

It is not a de Polignac number, because 115851081785 - 2⁴ = 115851081769 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 11585108174 + ... + 11585108183.

It is an arithmetic number, because the mean of its divisors is an integer number (34755324537).

Almost surely, 2^115851081785 is an apocalyptic number.

It is an amenable number.

115851081785 is a deficient number, since it is larger than the sum of its proper divisors (23170216363).

115851081785 is an equidigital number, since it uses as much as digits as its factorization.

115851081785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23170216362.

The product of its (nonzero) digits is 448000, while the sum is 50.

The spelling of 115851081785 in words is "one hundred fifteen billion, eight hundred fifty-one million, eighty-one thousand, seven hundred eighty-five".