866514881 has 2 divisors, whose sum is σ = 866514882. Its totient is φ = 866514880.

The previous prime is 866514863. The next prime is 866514919. The reversal of 866514881 is 188415668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775121281 + 91393600 = 27841^2 + 9560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866514881 is a prime.

It is a super-2 number, since 2×866514881² = 1501696077988888322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866514841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433257440 + 433257441.

It is an arithmetic number, because the mean of its divisors is an integer number (433257441).

Almost surely, 2^866514881 is an apocalyptic number.

It is an amenable number.

866514881 is a deficient number, since it is larger than the sum of its proper divisors (1).

866514881 is an equidigital number, since it uses as much as digits as its factorization.

866514881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 47.

The square root of 866514881 is about 29436.6248235086. The cubic root of 866514881 is about 953.3638389698.

The spelling of 866514881 in words is "eight hundred sixty-six million, five hundred fourteen thousand, eight hundred eighty-one".