866604457 has 2 divisors, whose sum is σ = 866604458. Its totient is φ = 866604456.

The previous prime is 866604443. The next prime is 866604469. The reversal of 866604457 is 754406668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512750736 + 353853721 = 22644^2 + 18811^2 .

It is a cyclic number.

It is not a de Polignac number, because 866604457 - 2⁷ = 866604329 is a prime.

It is not a weakly prime, because it can be changed into another prime (866604157) 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, 433302228 + 433302229.

It is an arithmetic number, because the mean of its divisors is an integer number (433302229).

Almost surely, 2^866604457 is an apocalyptic number.

It is an amenable number.

866604457 is a deficient number, since it is larger than the sum of its proper divisors (1).

866604457 is an equidigital number, since it uses as much as digits as its factorization.

866604457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 46.

The square root of 866604457 is about 29438.1462901454. The cubic root of 866604457 is about 953.3966891757.

The spelling of 866604457 in words is "eight hundred sixty-six million, six hundred four thousand, four hundred fifty-seven".