666631282 has 4 divisors (see below), whose sum is σ = 999946926. Its totient is φ = 333315640.

The previous prime is 666631261. The next prime is 666631313. The reversal of 666631282 is 282136666.

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., 535505881 + 131125401 = 23141^2 + 11451^2 .

It is a super-2 number, since 2×666631282² = 888794532281927048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166657819 + ... + 166657822.

Almost surely, 2^666631282 is an apocalyptic number.

666631282 is a deficient number, since it is larger than the sum of its proper divisors (333315644).

666631282 is a wasteful number, since it uses less digits than its factorization.

666631282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333315643.

The product of its digits is 124416, while the sum is 40.

The square root of 666631282 is about 25819.2037444999. The cubic root of 666631282 is about 873.5650087861.

The spelling of 666631282 in words is "six hundred sixty-six million, six hundred thirty-one thousand, two hundred eighty-two".