68457578185 has 4 divisors (see below), whose sum is σ = 82149093828. Its totient is φ = 54766062544.

The previous prime is 68457578183. The next prime is 68457578221. The reversal of 68457578185 is 58187575486.

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 8363468304 + 60094109881 = 91452^2 + 245141^2 .

It is a cyclic number.

It is not a de Polignac number, because 68457578185 - 2¹ = 68457578183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68457578183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6845757814 + ... + 6845757823.

It is an arithmetic number, because the mean of its divisors is an integer number (20537273457).

Almost surely, 2^68457578185 is an apocalyptic number.

It is an amenable number.

68457578185 is a deficient number, since it is larger than the sum of its proper divisors (13691515643).

68457578185 is a wasteful number, since it uses less digits than its factorization.

68457578185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13691515642.

The product of its digits is 75264000, while the sum is 64.

The spelling of 68457578185 in words is "sixty-eight billion, four hundred fifty-seven million, five hundred seventy-eight thousand, one hundred eighty-five".