6686762661 has 12 divisors (see below), whose sum is σ = 9674735980. Its totient is φ = 4450420800.

The previous prime is 6686762627. The next prime is 6686762669. The reversal of 6686762661 is 1662676866.

6686762661 is a `hidden beast` number, since 6 + 6 + 8 + 6 + 7 + 626 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5841697761 + 845064900 = 76431^2 + 29070^2 .

It is not a de Polignac number, because 6686762661 - 2⁶ = 6686762597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6686762598 and 6686762607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686762669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612706 + ... + 623523.

Almost surely, 2^6686762661 is an apocalyptic number.

It is an amenable number.

6686762661 is a deficient number, since it is larger than the sum of its proper divisors (2987973319).

6686762661 is a wasteful number, since it uses less digits than its factorization.

6686762661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236836 (or 1236833 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 6686762661 is about 81772.6278225177. The cubic root of 6686762661 is about 1883.9612662260.

The spelling of 6686762661 in words is "six billion, six hundred eighty-six million, seven hundred sixty-two thousand, six hundred sixty-one".