866861522 has 18 divisors (see below), whose sum is σ = 1319237829. Its totient is φ = 427205880.

The previous prime is 866861519. The next prime is 866861531. The reversal of 866861522 is 225168668.

866861522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 831803281 + 35058241 = 28841^2 + 5921^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20819.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4538447 + ... + 4538637.

Almost surely, 2^866861522 is an apocalyptic number.

866861522 is a deficient number, since it is larger than the sum of its proper divisors (452376307).

866861522 is an equidigital number, since it uses as much as digits as its factorization.

866861522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 302 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 866861522 is about 29442.5121550455. The cubic root of 866861522 is about 953.4909500535.

The spelling of 866861522 in words is "eight hundred sixty-six million, eight hundred sixty-one thousand, five hundred twenty-two".