866776879 has 2 divisors, whose sum is σ = 866776880. Its totient is φ = 866776878.

The previous prime is 866776753. The next prime is 866776913. The reversal of 866776879 is 978677668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866776879 - 2¹³ = 866768687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866776879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866776279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433388439 + 433388440.

It is an arithmetic number, because the mean of its divisors is an integer number (433388440).

Almost surely, 2^866776879 is an apocalyptic number.

866776879 is a deficient number, since it is larger than the sum of its proper divisors (1).

866776879 is an equidigital number, since it uses as much as digits as its factorization.

866776879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 64.

The square root of 866776879 is about 29441.0746916616. The cubic root of 866776879 is about 953.4599151229.

The spelling of 866776879 in words is "eight hundred sixty-six million, seven hundred seventy-six thousand, eight hundred seventy-nine".