666502231 has 4 divisors (see below), whose sum is σ = 666709264. Its totient is φ = 666295200.

The previous prime is 666502217. The next prime is 666502237. The reversal of 666502231 is 132205666.

666502231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 666502231 - 2¹³ = 666494039 is a prime.

It is a super-2 number, since 2×666502231² = 888450447855954722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666502193 and 666502202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666502237) 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, 98610 + ... + 105151.

It is an arithmetic number, because the mean of its divisors is an integer number (166677316).

Almost surely, 2^666502231 is an apocalyptic number.

666502231 is a deficient number, since it is larger than the sum of its proper divisors (207033).

666502231 is a wasteful number, since it uses less digits than its factorization.

666502231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207032.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 666502231 is about 25816.7044953456. The cubic root of 666502231 is about 873.5086349372.

Adding to 666502231 its reverse (132205666), we get a palindrome (798707897).

The spelling of 666502231 in words is "six hundred sixty-six million, five hundred two thousand, two hundred thirty-one".