866226781 has 16 divisors (see below), whose sum is σ = 1034691840. Its totient is φ = 709470720.

The previous prime is 866226749. The next prime is 866226791. The reversal of 866226781 is 187622668.

866226781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866226781 - 2⁵ = 866226749 is a prime.

It is a super-2 number, since 2×866226781² = 1500697672243243922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866226791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2305 + ... + 41686.

It is an arithmetic number, because the mean of its divisors is an integer number (64668240).

Almost surely, 2^866226781 is an apocalyptic number.

It is an amenable number.

866226781 is a deficient number, since it is larger than the sum of its proper divisors (168465059).

866226781 is a wasteful number, since it uses less digits than its factorization.

866226781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44124.

The product of its digits is 387072, while the sum is 46.

The square root of 866226781 is about 29431.7308529417. The cubic root of 866226781 is about 953.2581687062.

The spelling of 866226781 in words is "eight hundred sixty-six million, two hundred twenty-six thousand, seven hundred eighty-one".