866085739 has 2 divisors, whose sum is σ = 866085740. Its totient is φ = 866085738.

The previous prime is 866085709. The next prime is 866085767. The reversal of 866085739 is 937580668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866085739 - 2⁵ = 866085707 is a prime.

It is a super-2 number, since 2×866085739² = 1500209014598352242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866085709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433042869 + 433042870.

It is an arithmetic number, because the mean of its divisors is an integer number (433042870).

Almost surely, 2^866085739 is an apocalyptic number.

866085739 is a deficient number, since it is larger than the sum of its proper divisors (1).

866085739 is an equidigital number, since it uses as much as digits as its factorization.

866085739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 866085739 is about 29429.3346679805. The cubic root of 866085739 is about 953.2064283154.

The spelling of 866085739 in words is "eight hundred sixty-six million, eighty-five thousand, seven hundred thirty-nine".