6673406661 has 12 divisors (see below), whose sum is σ = 10206386892. Its totient is φ = 4187235456.

The previous prime is 6673406603. The next prime is 6673406669. The reversal of 6673406661 is 1666043766.

It can be written as a sum of positive squares in 2 ways, for example, as 2384466561 + 4288940100 = 48831^2 + 65490^2 .

It is not a de Polignac number, because 6673406661 - 2⁹ = 6673406149 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6673406669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21808366 + ... + 21808671.

It is an arithmetic number, because the mean of its divisors is an integer number (850532241).

Almost surely, 2^6673406661 is an apocalyptic number.

It is an amenable number.

6673406661 is a deficient number, since it is larger than the sum of its proper divisors (3532980231).

6673406661 is a wasteful number, since it uses less digits than its factorization.

6673406661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43617060 (or 43617057 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 6673406661 is about 81690.9215335462. The cubic root of 6673406661 is about 1882.7061018876.

The spelling of 6673406661 in words is "six billion, six hundred seventy-three million, four hundred six thousand, six hundred sixty-one".