8613261666 has 24 divisors (see below), whose sum is σ = 18809017344. Its totient is φ = 2848479480.

The previous prime is 8613261653. The next prime is 8613261677. The reversal of 8613261666 is 6661623168.

It is a Curzon 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, 1881630 + ... + 1886201.

It is an arithmetic number, because the mean of its divisors is an integer number (783709056).

Almost surely, 2^8613261666 is an apocalyptic number.

8613261666 is an abundant number, since it is smaller than the sum of its proper divisors (10195755678).

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

8613261666 is a wasteful number, since it uses less digits than its factorization.

8613261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767966 (or 3767963 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 8613261666 is about 92807.6595222614. The cubic root of 8613261666 is about 2049.8521936661.

The spelling of 8613261666 in words is "eight billion, six hundred thirteen million, two hundred sixty-one thousand, six hundred sixty-six".