866145023 has 2 divisors, whose sum is σ = 866145024. Its totient is φ = 866145022.

The previous prime is 866145011. The next prime is 866145031. The reversal of 866145023 is 320541668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866145023 - 2⁶ = 866144959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866145043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433072511 + 433072512.

It is an arithmetic number, because the mean of its divisors is an integer number (433072512).

Almost surely, 2^866145023 is an apocalyptic number.

866145023 is a deficient number, since it is larger than the sum of its proper divisors (1).

866145023 is an equidigital number, since it uses as much as digits as its factorization.

866145023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 866145023 is about 29430.3418770493. The cubic root of 866145023 is about 953.2281769707.

The spelling of 866145023 in words is "eight hundred sixty-six million, one hundred forty-five thousand, twenty-three".