66422881 has 12 divisors (see below), whose sum is σ = 79357908. Its totient is φ = 55393632.

The previous prime is 66422861. The next prime is 66422887. The reversal of 66422881 is 18822466.

66422881 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 43296400 + 23126481 = 6580^2 + 4809^2 .

It is not a de Polignac number, because 66422881 - 2⁷ = 66422753 is a prime.

It is a super-2 number, since 2×66422881² = 8823998240680322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 66422881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66422887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16506 + ... + 20131.

It is an arithmetic number, because the mean of its divisors is an integer number (6613159).

Almost surely, 2^66422881 is an apocalyptic number.

It is an amenable number.

66422881 is a deficient number, since it is larger than the sum of its proper divisors (12935027).

66422881 is a wasteful number, since it uses less digits than its factorization.

66422881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36688 (or 36681 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 66422881 is about 8150.0233741996. The cubic root of 66422881 is about 404.9852781317.

The spelling of 66422881 in words is "sixty-six million, four hundred twenty-two thousand, eight hundred eighty-one".