866125217 has 8 divisors (see below), whose sum is σ = 882600960. Its totient is φ = 849774240.

The previous prime is 866125207. The next prime is 866125243. The reversal of 866125217 is 712521668.

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 866125217 - 2⁴ = 866125201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866125207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17117 + ... + 45002.

It is an arithmetic number, because the mean of its divisors is an integer number (110325120).

Almost surely, 2^866125217 is an apocalyptic number.

It is an amenable number.

866125217 is a deficient number, since it is larger than the sum of its proper divisors (16475743).

866125217 is a wasteful number, since it uses less digits than its factorization.

866125217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62383.

The product of its digits is 40320, while the sum is 38.

The square root of 866125217 is about 29430.0053856604. The cubic root of 866125217 is about 953.2209111431.

The spelling of 866125217 in words is "eight hundred sixty-six million, one hundred twenty-five thousand, two hundred seventeen".