866648357 has 2 divisors, whose sum is σ = 866648358. Its totient is φ = 866648356.

The previous prime is 866648353. The next prime is 866648371. The reversal of 866648357 is 753846668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655411201 + 211237156 = 25601^2 + 14534^2 .

It is a cyclic number.

It is not a de Polignac number, because 866648357 - 2² = 866648353 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 866648299 and 866648308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866648351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433324178 + 433324179.

It is an arithmetic number, because the mean of its divisors is an integer number (433324179).

Almost surely, 2^866648357 is an apocalyptic number.

It is an amenable number.

866648357 is a deficient number, since it is larger than the sum of its proper divisors (1).

866648357 is an equidigital number, since it uses as much as digits as its factorization.

866648357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 53.

The square root of 866648357 is about 29438.8919118910. The cubic root of 866648357 is about 953.4127877959.

The spelling of 866648357 in words is "eight hundred sixty-six million, six hundred forty-eight thousand, three hundred fifty-seven".