185705680812 has 12 divisors (see below), whose sum is σ = 433313255256. Its totient is φ = 61901893600.

The previous prime is 185705680711. The next prime is 185705680813. The reversal of 185705680812 is 218086507581.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (185705680813) 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, 7737736689 + ... + 7737736712.

It is an arithmetic number, because the mean of its divisors is an integer number (36109437938).

Almost surely, 2^185705680812 is an apocalyptic number.

185705680812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

185705680812 is an abundant number, since it is smaller than the sum of its proper divisors (247607574444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

185705680812 is a wasteful number, since it uses less digits than its factorization.

185705680812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475473408 (or 15475473406 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 51.

The spelling of 185705680812 in words is "one hundred eighty-five billion, seven hundred five million, six hundred eighty thousand, eight hundred twelve".