666260631 has 24 divisors (see below), whose sum is σ = 1014624000. Its totient is φ = 420133392.

The previous prime is 666260599. The next prime is 666260633. The reversal of 666260631 is 136062666.

It is not a de Polignac number, because 666260631 - 2⁵ = 666260599 is a prime.

It is a super-2 number, since 2×666260631² = 887806456841036322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666260633) 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 23 ways as a sum of consecutive naturals, for example, 120240 + ... + 125658.

It is an arithmetic number, because the mean of its divisors is an integer number (42276000).

Almost surely, 2^666260631 is an apocalyptic number.

666260631 is a deficient number, since it is larger than the sum of its proper divisors (348363369).

666260631 is a wasteful number, since it uses less digits than its factorization.

666260631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6163 (or 6160 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 666260631 is about 25812.0249302530. The cubic root of 666260631 is about 873.4030763052.

The spelling of 666260631 in words is "six hundred sixty-six million, two hundred sixty thousand, six hundred thirty-one".