866724458635117 has 2 divisors, whose sum is σ = 866724458635118. Its totient is φ = 866724458635116.

The previous prime is 866724458635103. The next prime is 866724458635159. The reversal of 866724458635117 is 711536854427668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828826903737316 + 37897554897801 = 28789354^2 + 6156099^2 .

It is a cyclic number.

It is not a de Polignac number, because 866724458635117 - 2¹⁹ = 866724458110829 is a prime.

It is a super-2 number, since 2×866724458635117² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866724458635117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866724458635517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433362229317558 + 433362229317559.

It is an arithmetic number, because the mean of its divisors is an integer number (433362229317559).

Almost surely, 2^{866724458635117} is an apocalyptic number.

It is an amenable number.

866724458635117 is a deficient number, since it is larger than the sum of its proper divisors (1).

866724458635117 is an equidigital number, since it uses as much as digits as its factorization.

866724458635117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1625702400, while the sum is 73.

The spelling of 866724458635117 in words is "eight hundred sixty-six trillion, seven hundred twenty-four billion, four hundred fifty-eight million, six hundred thirty-five thousand, one hundred seventeen".