866507667555223 has 4 divisors (see below), whose sum is σ = 874457279184280. Its totient is φ = 858558055926168.

The previous prime is 866507667555199. The next prime is 866507667555247. The reversal of 866507667555223 is 322555766705668.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (866507667555199) and next prime (866507667555247).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866507667555223 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 (866507667555253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3974805814365 + ... + 3974805814582.

It is an arithmetic number, because the mean of its divisors is an integer number (218614319796070).

Almost surely, 2^{866507667555223} is an apocalyptic number.

866507667555223 is a deficient number, since it is larger than the sum of its proper divisors (7949611629057).

866507667555223 is a wasteful number, since it uses less digits than its factorization.

866507667555223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949611629056.

The product of its (nonzero) digits is 3810240000, while the sum is 73.

The spelling of 866507667555223 in words is "eight hundred sixty-six trillion, five hundred seven billion, six hundred sixty-seven million, five hundred fifty-five thousand, two hundred twenty-three".