666550322 has 4 divisors (see below), whose sum is σ = 999825486. Its totient is φ = 333275160.

The previous prime is 666550321. The next prime is 666550387. The reversal of 666550322 is 223055666.

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

It can be written as a sum of positive squares in only one way, i.e., 630562321 + 35988001 = 25111^2 + 5999^2 .

It is not an unprimeable number, because it can be changed into a prime (666550321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166637579 + ... + 166637582.

Almost surely, 2^666550322 is an apocalyptic number.

666550322 is a deficient number, since it is larger than the sum of its proper divisors (333275164).

666550322 is a wasteful number, since it uses less digits than its factorization.

666550322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333275163.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 666550322 is about 25817.6358716285. The cubic root of 666550322 is about 873.5296435658.

The spelling of 666550322 in words is "six hundred sixty-six million, five hundred fifty thousand, three hundred twenty-two".