866081011 has 2 divisors, whose sum is σ = 866081012. Its totient is φ = 866081010.

The previous prime is 866080981. The next prime is 866081023. The reversal of 866081011 is 110180668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866081011 - 2¹³ = 866072819 is a prime.

It is a super-2 number, since 2×866081011² = 1500192635229564242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866081071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433040505 + 433040506.

It is an arithmetic number, because the mean of its divisors is an integer number (433040506).

Almost surely, 2^866081011 is an apocalyptic number.

866081011 is a deficient number, since it is larger than the sum of its proper divisors (1).

866081011 is an equidigital number, since it uses as much as digits as its factorization.

866081011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 866081011 is about 29429.2543398571. The cubic root of 866081011 is about 953.2046937803.

The spelling of 866081011 in words is "eight hundred sixty-six million, eighty-one thousand, eleven".