666228733 has 4 divisors (see below), whose sum is σ = 675355228. Its totient is φ = 657102240.

The previous prime is 666228727. The next prime is 666228751. The reversal of 666228733 is 337822666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152843769 + 513384964 = 12363^2 + 22658^2 .

It is a cyclic number.

It is not a de Polignac number, because 666228733 - 2⁵ = 666228701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666228733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666228133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4563138 + ... + 4563283.

It is an arithmetic number, because the mean of its divisors is an integer number (168838807).

Almost surely, 2^666228733 is an apocalyptic number.

It is an amenable number.

666228733 is a deficient number, since it is larger than the sum of its proper divisors (9126495).

666228733 is an equidigital number, since it uses as much as digits as its factorization.

666228733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9126494.

The product of its digits is 435456, while the sum is 43.

The square root of 666228733 is about 25811.4070325506. The cubic root of 666228733 is about 873.3891376879.

The spelling of 666228733 in words is "six hundred sixty-six million, two hundred twenty-eight thousand, seven hundred thirty-three".