6446566993 has 4 divisors (see below), whose sum is σ = 6519000420. Its totient is φ = 6374133568.

The previous prime is 6446566979. The next prime is 6446566999. The reversal of 6446566993 is 3996656446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1452600769 + 4993966224 = 38113^2 + 70668^2 .

It is a cyclic number.

It is not a de Polignac number, because 6446566993 - 2²⁹ = 5909696081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6446566999) 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, 36216580 + ... + 36216757.

It is an arithmetic number, because the mean of its divisors is an integer number (1629750105).

Almost surely, 2^6446566993 is an apocalyptic number.

It is an amenable number.

6446566993 is a deficient number, since it is larger than the sum of its proper divisors (72433427).

6446566993 is an equidigital number, since it uses as much as digits as its factorization.

6446566993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72433426.

The product of its digits is 25194240, while the sum is 58.

The square root of 6446566993 is about 80290.5162083294. The cubic root of 6446566993 is about 1861.1276733124.

The spelling of 6446566993 in words is "six billion, four hundred forty-six million, five hundred sixty-six thousand, nine hundred ninety-three".