66228761 has 8 divisors (see below), whose sum is σ = 66750024. Its totient is φ = 65710080.

The previous prime is 66228733. The next prime is 66228769. The reversal of 66228761 is 16782266.

It is a happy number.

66228761 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 4 ways, for example, as 13579225 + 52649536 = 3685^2 + 7256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66228761 - 2¹⁰ = 66227737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66228769) 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 7 ways as a sum of consecutive naturals, for example, 103001 + ... + 103641.

It is an arithmetic number, because the mean of its divisors is an integer number (8343753).

Almost surely, 2^66228761 is an apocalyptic number.

It is an amenable number.

66228761 is a deficient number, since it is larger than the sum of its proper divisors (521263).

66228761 is a wasteful number, since it uses less digits than its factorization.

66228761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its digits is 48384, while the sum is 38.

The square root of 66228761 is about 8138.1054920663. The cubic root of 66228761 is about 404.5903717878.

The spelling of 66228761 in words is "sixty-six million, two hundred twenty-eight thousand, seven hundred sixty-one".