866760722322491 has 2 divisors, whose sum is σ = 866760722322492. Its totient is φ = 866760722322490.

The previous prime is 866760722322437. The next prime is 866760722322557. The reversal of 866760722322491 is 194223227067668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866760722322491 - 2⁴² = 862362675811387 is a prime.

It is a super-2 number, since 2×866760722322491² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866760722372491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433380361161245 + 433380361161246.

It is an arithmetic number, because the mean of its divisors is an integer number (433380361161246).

Almost surely, 2^{866760722322491} is an apocalyptic number.

866760722322491 is a deficient number, since it is larger than the sum of its proper divisors (1).

866760722322491 is an equidigital number, since it uses as much as digits as its factorization.

866760722322491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 146313216, while the sum is 65.

The spelling of 866760722322491 in words is "eight hundred sixty-six trillion, seven hundred sixty billion, seven hundred twenty-two million, three hundred twenty-two thousand, four hundred ninety-one".