666702231 has 16 divisors (see below), whose sum is σ = 968854656. Its totient is φ = 405333216.

The previous prime is 666702221. The next prime is 666702233. The reversal of 666702231 is 132207666.

It is not a de Polignac number, because 666702231 - 2⁷ = 666702103 is a prime.

It is a super-2 number, since 2×666702231² = 888983729640754722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666702192 and 666702201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666702233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99745 + ... + 106218.

It is an arithmetic number, because the mean of its divisors is an integer number (60553416).

Almost surely, 2^666702231 is an apocalyptic number.

666702231 is a deficient number, since it is larger than the sum of its proper divisors (302152425).

666702231 is a wasteful number, since it uses less digits than its factorization.

666702231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206062.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 666702231 is about 25820.5776658850. The cubic root of 666702231 is about 873.5959986135.

Adding to 666702231 its reverse (132207666), we get a palindrome (798909897).

The spelling of 666702231 in words is "six hundred sixty-six million, seven hundred two thousand, two hundred thirty-one".