6640369673 has 4 divisors (see below), whose sum is σ = 7588993920. Its totient is φ = 5691745428.

The previous prime is 6640369661. The next prime is 6640369741. The reversal of 6640369673 is 3769630466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6640369673 - 2¹² = 6640365577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6640359673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474312113 + ... + 474312126.

It is an arithmetic number, because the mean of its divisors is an integer number (1897248480).

Almost surely, 2^6640369673 is an apocalyptic number.

It is an amenable number.

6640369673 is a deficient number, since it is larger than the sum of its proper divisors (948624247).

6640369673 is an equidigital number, since it uses as much as digits as its factorization.

6640369673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948624246.

The product of its (nonzero) digits is 2939328, while the sum is 50.

The square root of 6640369673 is about 81488.4634350164. The cubic root of 6640369673 is about 1879.5941549817.

The spelling of 6640369673 in words is "six billion, six hundred forty million, three hundred sixty-nine thousand, six hundred seventy-three".