866313853180631 has 2 divisors, whose sum is σ = 866313853180632. Its totient is φ = 866313853180630.

The previous prime is 866313853180619. The next prime is 866313853180687. The reversal of 866313853180631 is 136081358313668.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866313853180631 is a prime.

It is a super-2 number, since 2×866313853180631² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866313853110631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433156926590315 + 433156926590316.

It is an arithmetic number, because the mean of its divisors is an integer number (433156926590316).

Almost surely, 2^{866313853180631} is an apocalyptic number.

866313853180631 is a deficient number, since it is larger than the sum of its proper divisors (1).

866313853180631 is an equidigital number, since it uses as much as digits as its factorization.

866313853180631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44789760, while the sum is 62.

The spelling of 866313853180631 in words is "eight hundred sixty-six trillion, three hundred thirteen billion, eight hundred fifty-three million, one hundred eighty thousand, six hundred thirty-one".