866786514038461 has 2 divisors, whose sum is σ = 866786514038462. Its totient is φ = 866786514038460.

The previous prime is 866786514038449. The next prime is 866786514038483. The reversal of 866786514038461 is 164830415687668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714984549248025 + 151801964790436 = 26739195^2 + 12320794^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786514038461 - 2⁵ = 866786514038429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866786514038491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393257019230 + 433393257019231.

It is an arithmetic number, because the mean of its divisors is an integer number (433393257019231).

Almost surely, 2^{866786514038461} is an apocalyptic number.

It is an amenable number.

866786514038461 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786514038461 is an equidigital number, since it uses as much as digits as its factorization.

866786514038461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1114767360, while the sum is 73.

The spelling of 866786514038461 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, thirty-eight thousand, four hundred sixty-one".