8366557806 has 48 divisors (see below), whose sum is σ = 18324100080. Its totient is φ = 2758665600.

The previous prime is 8366557753. The next prime is 8366557807. The reversal of 8366557806 is 6087556638.

8366557806 is a `hidden beast` number, since 8 + 3 + 6 + 6 + 557 + 80 + 6 = 666.

It is a super-2 number, since 2×8366557806² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8366557807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3796701 + ... + 3798903.

It is an arithmetic number, because the mean of its divisors is an integer number (381752085).

Almost surely, 2^8366557806 is an apocalyptic number.

8366557806 is an abundant number, since it is smaller than the sum of its proper divisors (9957542274).

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

8366557806 is a wasteful number, since it uses less digits than its factorization.

8366557806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401 (or 4398 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The square root of 8366557806 is about 91468.8898259949. The cubic root of 8366557806 is about 2030.0914650563.

The spelling of 8366557806 in words is "eight billion, three hundred sixty-six million, five hundred fifty-seven thousand, eight hundred six".