866006513 has 2 divisors, whose sum is σ = 866006514. Its totient is φ = 866006512.

The previous prime is 866006509. The next prime is 866006539. The reversal of 866006513 is 315600668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821223649 + 44782864 = 28657^2 + 6692^2 .

It is a cyclic number.

It is not a de Polignac number, because 866006513 - 2² = 866006509 is a prime.

It is not a weakly prime, because it can be changed into another prime (866006573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433003256 + 433003257.

It is an arithmetic number, because the mean of its divisors is an integer number (433003257).

Almost surely, 2^866006513 is an apocalyptic number.

It is an amenable number.

866006513 is a deficient number, since it is larger than the sum of its proper divisors (1).

866006513 is an equidigital number, since it uses as much as digits as its factorization.

866006513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 866006513 is about 29427.9885992910. The cubic root of 866006513 is about 953.1773622803.

The spelling of 866006513 in words is "eight hundred sixty-six million, six thousand, five hundred thirteen".