8461561806 has 24 divisors (see below), whose sum is σ = 19012399224. Its totient is φ = 2820520440.

The previous prime is 8461561799. The next prime is 8461561811. The reversal of 8461561806 is 6081651648.

8461561806 is a `hidden beast` number, since 8 + 4 + 6 + 1 + 561 + 80 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8704825 + ... + 8705796.

It is an arithmetic number, because the mean of its divisors is an integer number (792183301).

Almost surely, 2^8461561806 is an apocalyptic number.

8461561806 is an abundant number, since it is smaller than the sum of its proper divisors (10550837418).

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

8461561806 is a wasteful number, since it uses less digits than its factorization.

8461561806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17410638 (or 17410626 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 8461561806 is about 91986.7479912188. The cubic root of 8461561806 is about 2037.7465991616.

The spelling of 8461561806 in words is "eight billion, four hundred sixty-one million, five hundred sixty-one thousand, eight hundred six".