866786026508387 has 2 divisors, whose sum is σ = 866786026508388. Its totient is φ = 866786026508386.

The previous prime is 866786026508377. The next prime is 866786026508477. The reversal of 866786026508387 is 783805620687668.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866786026508387 - 2⁸ = 866786026508131 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786026508327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393013254193 + 433393013254194.

It is an arithmetic number, because the mean of its divisors is an integer number (433393013254194).

Almost surely, 2^{866786026508387} is an apocalyptic number.

866786026508387 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786026508387 is an equidigital number, since it uses as much as digits as its factorization.

866786026508387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7803371520, while the sum is 80.

The spelling of 866786026508387 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, twenty-six million, five hundred eight thousand, three hundred eighty-seven".