866775823 has 2 divisors, whose sum is σ = 866775824. Its totient is φ = 866775822.

The previous prime is 866775781. The next prime is 866775827. The reversal of 866775823 is 328577668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866775823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866775827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433387911 + 433387912.

It is an arithmetic number, because the mean of its divisors is an integer number (433387912).

Almost surely, 2^866775823 is an apocalyptic number.

866775823 is a deficient number, since it is larger than the sum of its proper divisors (1).

866775823 is an equidigital number, since it uses as much as digits as its factorization.

866775823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 52.

The square root of 866775823 is about 29441.0567575283. The cubic root of 866775823 is about 953.4595279206.

The spelling of 866775823 in words is "eight hundred sixty-six million, seven hundred seventy-five thousand, eight hundred twenty-three".