866572379 has 2 divisors, whose sum is σ = 866572380. Its totient is φ = 866572378.

The previous prime is 866572363. The next prime is 866572393. The reversal of 866572379 is 973275668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866572379 - 2⁴ = 866572363 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866572379.

It is not a weakly prime, because it can be changed into another prime (866572309) 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, 433286189 + 433286190.

It is an arithmetic number, because the mean of its divisors is an integer number (433286190).

Almost surely, 2^866572379 is an apocalyptic number.

866572379 is a deficient number, since it is larger than the sum of its proper divisors (1).

866572379 is an equidigital number, since it uses as much as digits as its factorization.

866572379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 53.

The square root of 866572379 is about 29437.6014478082. The cubic root of 866572379 is about 953.3849254712.

The spelling of 866572379 in words is "eight hundred sixty-six million, five hundred seventy-two thousand, three hundred seventy-nine".