866786278584953 has 2 divisors, whose sum is σ = 866786278584954. Its totient is φ = 866786278584952.

The previous prime is 866786278584943. The next prime is 866786278584973. The reversal of 866786278584953 is 359485872687668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866758172733049 + 28105851904 = 29440757^2 + 167648^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786278584953 - 2¹⁴ = 866786278568569 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786278584943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393139292476 + 433393139292477.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139292477).

Almost surely, 2^{866786278584953} is an apocalyptic number.

It is an amenable number.

866786278584953 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278584953 is an equidigital number, since it uses as much as digits as its factorization.

866786278584953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 234101145600, while the sum is 92.

The spelling of 866786278584953 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-four thousand, nine hundred fifty-three".