666633746 has 4 divisors (see below), whose sum is σ = 999950622. Its totient is φ = 333316872.

The previous prime is 666633731. The next prime is 666633749. The reversal of 666633746 is 647336666.

It is a happy number.

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., 664350625 + 2283121 = 25775^2 + 1511^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666633746.

It is not an unprimeable number, because it can be changed into a prime (666633749) 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 as a sum of consecutive naturals, namely, 166658435 + ... + 166658438.

Almost surely, 2^666633746 is an apocalyptic number.

666633746 is a deficient number, since it is larger than the sum of its proper divisors (333316876).

666633746 is a wasteful number, since it uses less digits than its factorization.

666633746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333316875.

The product of its digits is 1959552, while the sum is 47.

The square root of 666633746 is about 25819.2514608770. The cubic root of 666633746 is about 873.5660850740.

The spelling of 666633746 in words is "six hundred sixty-six million, six hundred thirty-three thousand, seven hundred forty-six".