8180550685 has 4 divisors (see below), whose sum is σ = 9816660828. Its totient is φ = 6544440544.

The previous prime is 8180550641. The next prime is 8180550701. The reversal of 8180550685 is 5860550818.

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 1294704324 + 6885846361 = 35982^2 + 82981^2 .

It is a cyclic number.

It is not a de Polignac number, because 8180550685 - 2¹¹ = 8180548637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818055064 + ... + 818055073.

It is an arithmetic number, because the mean of its divisors is an integer number (2454165207).

Almost surely, 2^8180550685 is an apocalyptic number.

It is an amenable number.

8180550685 is a deficient number, since it is larger than the sum of its proper divisors (1636110143).

8180550685 is a wasteful number, since it uses less digits than its factorization.

8180550685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636110142.

The product of its (nonzero) digits is 384000, while the sum is 46.

The square root of 8180550685 is about 90446.3967496771. The cubic root of 8180550685 is about 2014.9340991979.

The spelling of 8180550685 in words is "eight billion, one hundred eighty million, five hundred fifty thousand, six hundred eighty-five".