866338661 has 8 divisors (see below), whose sum is σ = 875167200. Its totient is φ = 857523888.

The previous prime is 866338657. The next prime is 866338667. The reversal of 866338661 is 166833668.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866338661 - 2² = 866338657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866338667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163130 + ... + 168356.

It is an arithmetic number, because the mean of its divisors is an integer number (109395900).

Almost surely, 2^866338661 is an apocalyptic number.

It is an amenable number.

866338661 is a deficient number, since it is larger than the sum of its proper divisors (8828539).

866338661 is a wasteful number, since it uses less digits than its factorization.

866338661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6883.

The product of its digits is 746496, while the sum is 47.

The square root of 866338661 is about 29433.6314613063. The cubic root of 866338661 is about 953.2992072021.

The spelling of 866338661 in words is "eight hundred sixty-six million, three hundred thirty-eight thousand, six hundred sixty-one".