866940598877251 has 2 divisors, whose sum is σ = 866940598877252. Its totient is φ = 866940598877250.

The previous prime is 866940598877233. The next prime is 866940598877257. The reversal of 866940598877251 is 152778895049668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866940598877251 - 2¹⁷ = 866940598746179 is a prime.

It is not a weakly prime, because it can be changed into another prime (866940598877257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433470299438625 + 433470299438626.

It is an arithmetic number, because the mean of its divisors is an integer number (433470299438626).

Almost surely, 2^{866940598877251} is an apocalyptic number.

866940598877251 is a deficient number, since it is larger than the sum of its proper divisors (1).

866940598877251 is an equidigital number, since it uses as much as digits as its factorization.

866940598877251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14631321600, while the sum is 85.

The spelling of 866940598877251 in words is "eight hundred sixty-six trillion, nine hundred forty billion, five hundred ninety-eight million, eight hundred seventy-seven thousand, two hundred fifty-one".