866716411381 has 2 divisors, whose sum is σ = 866716411382. Its totient is φ = 866716411380.

The previous prime is 866716411373. The next prime is 866716411409. The reversal of 866716411381 is 183114617668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638169311025 + 228547100356 = 798855^2 + 478066^2 .

It is a cyclic number.

It is not a de Polignac number, because 866716411381 - 2³ = 866716411373 is a prime.

It is a super-2 number, since 2×866716411381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866716411081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433358205690 + 433358205691.

It is an arithmetic number, because the mean of its divisors is an integer number (433358205691).

Almost surely, 2^866716411381 is an apocalyptic number.

It is an amenable number.

866716411381 is a deficient number, since it is larger than the sum of its proper divisors (1).

866716411381 is an equidigital number, since it uses as much as digits as its factorization.

866716411381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The spelling of 866716411381 in words is "eight hundred sixty-six billion, seven hundred sixteen million, four hundred eleven thousand, three hundred eighty-one".