866425857 has 16 divisors (see below), whose sum is σ = 1260748800. Its totient is φ = 524901200.

The previous prime is 866425811. The next prime is 866425891. The reversal of 866425857 is 758524668.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 866425857 - 2⁶ = 866425793 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (866425957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155632 + ... + 161102.

It is an arithmetic number, because the mean of its divisors is an integer number (78796800).

Almost surely, 2^866425857 is an apocalyptic number.

It is an amenable number.

866425857 is a deficient number, since it is larger than the sum of its proper divisors (394322943).

866425857 is a wasteful number, since it uses less digits than its factorization.

866425857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284.

The product of its digits is 3225600, while the sum is 51.

The square root of 866425857 is about 29435.1126547870. The cubic root of 866425857 is about 953.3311889558.

The spelling of 866425857 in words is "eight hundred sixty-six million, four hundred twenty-five thousand, eight hundred fifty-seven".