85178657205 has 54 divisors (see below), whose sum is σ = 149189466114. Its totient is φ = 44957697408.

The previous prime is 85178657203. The next prime is 85178657231. The reversal of 85178657205 is 50275687158.

It can be written as a sum of positive squares in 3 ways, for example, as 11936436516 + 73242220689 = 109254^2 + 270633^2 .

It is not a de Polignac number, because 85178657205 - 2¹ = 85178657203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85178657203) by changing a digit.

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 53 ways as a sum of consecutive naturals, for example, 272136129 + ... + 272136441.

It is an arithmetic number, because the mean of its divisors is an integer number (2762767891).

Almost surely, 2^85178657205 is an apocalyptic number.

It is an amenable number.

85178657205 is a deficient number, since it is larger than the sum of its proper divisors (64010808909).

85178657205 is an equidigital number, since it uses as much as digits as its factorization.

85178657205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 54.

The spelling of 85178657205 in words is "eighty-five billion, one hundred seventy-eight million, six hundred fifty-seven thousand, two hundred five".