866694847 has 2 divisors, whose sum is σ = 866694848. Its totient is φ = 866694846.

The previous prime is 866694811. The next prime is 866694877. The reversal of 866694847 is 748496668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866694847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866694791 and 866694800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866694877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433347423 + 433347424.

It is an arithmetic number, because the mean of its divisors is an integer number (433347424).

Almost surely, 2^866694847 is an apocalyptic number.

866694847 is a deficient number, since it is larger than the sum of its proper divisors (1).

866694847 is an equidigital number, since it uses as much as digits as its factorization.

866694847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 58.

The square root of 866694847 is about 29439.6815030326. The cubic root of 866694847 is about 953.4298356052.

The spelling of 866694847 in words is "eight hundred sixty-six million, six hundred ninety-four thousand, eight hundred forty-seven".