866329481 has 2 divisors, whose sum is σ = 866329482. Its totient is φ = 866329480.

The previous prime is 866329447. The next prime is 866329483. The reversal of 866329481 is 184923668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640849225 + 225480256 = 25315^2 + 15016^2 .

It is a cyclic number.

It is not a de Polignac number, because 866329481 - 2⁶ = 866329417 is a prime.

It is a super-2 number, since 2×866329481² = 1501053539299458722, which contains 22 as substring.

Together with 866329483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866329483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433164740 + 433164741.

It is an arithmetic number, because the mean of its divisors is an integer number (433164741).

Almost surely, 2^866329481 is an apocalyptic number.

It is an amenable number.

866329481 is a deficient number, since it is larger than the sum of its proper divisors (1).

866329481 is an equidigital number, since it uses as much as digits as its factorization.

866329481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 866329481 is about 29433.4755168329. The cubic root of 866329481 is about 953.2958400363.

The spelling of 866329481 in words is "eight hundred sixty-six million, three hundred twenty-nine thousand, four hundred eighty-one".