666645076 has 12 divisors (see below), whose sum is σ = 1195083540. Its totient is φ = 325192640.

The previous prime is 666645073. The next prime is 666645103. The reversal of 666645076 is 670546666.

666645076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 330876100 + 335768976 = 18190^2 + 18324^2 .

It is a super-3 number, since 3×666645076³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666645073) 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, 2032291 + ... + 2032618.

It is an arithmetic number, because the mean of its divisors is an integer number (99590295).

Almost surely, 2^666645076 is an apocalyptic number.

It is an amenable number.

666645076 is a deficient number, since it is larger than the sum of its proper divisors (528438464).

666645076 is a wasteful number, since it uses less digits than its factorization.

666645076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064954 (or 4064952 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The square root of 666645076 is about 25819.4708698687. The cubic root of 666645076 is about 873.5710340422.

The spelling of 666645076 in words is "six hundred sixty-six million, six hundred forty-five thousand, seventy-six".