866450861797 has 2 divisors, whose sum is σ = 866450861798. Its totient is φ = 866450861796.

The previous prime is 866450861737. The next prime is 866450861827. The reversal of 866450861797 is 797168054668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855848864641 + 10601997156 = 925121^2 + 102966^2 .

It is a cyclic number.

It is not a de Polignac number, because 866450861797 - 2¹⁵ = 866450829029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866450861737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433225430898 + 433225430899.

It is an arithmetic number, because the mean of its divisors is an integer number (433225430899).

Almost surely, 2^866450861797 is an apocalyptic number.

It is an amenable number.

866450861797 is a deficient number, since it is larger than the sum of its proper divisors (1).

866450861797 is an equidigital number, since it uses as much as digits as its factorization.

866450861797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121927680, while the sum is 67.

The spelling of 866450861797 in words is "eight hundred sixty-six billion, four hundred fifty million, eight hundred sixty-one thousand, seven hundred ninety-seven".