866757166085801 has 2 divisors, whose sum is σ = 866757166085802. Its totient is φ = 866757166085800.

The previous prime is 866757166085777. The next prime is 866757166085821. The reversal of 866757166085801 is 108580661757668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 596414546560000 + 270342619525801 = 24421600^2 + 16442099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866757166085801 is a prime.

It is a super-2 number, since 2×866757166085801² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866757166085821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433378583042900 + 433378583042901.

It is an arithmetic number, because the mean of its divisors is an integer number (433378583042901).

Almost surely, 2^{866757166085801} is an apocalyptic number.

It is an amenable number.

866757166085801 is a deficient number, since it is larger than the sum of its proper divisors (1).

866757166085801 is an equidigital number, since it uses as much as digits as its factorization.

866757166085801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 812851200, while the sum is 74.

The spelling of 866757166085801 in words is "eight hundred sixty-six trillion, seven hundred fifty-seven billion, one hundred sixty-six million, eighty-five thousand, eight hundred one".