6646589744497 has 4 divisors (see below), whose sum is σ = 6647696224576. Its totient is φ = 6645483264420.

The previous prime is 6646589744449. The next prime is 6646589744533. The reversal of 6646589744497 is 7944479856466.

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 a de Polignac number, because none of the positive numbers 2^k-6646589744497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646589744407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553231029 + ... + 553243042.

It is an arithmetic number, because the mean of its divisors is an integer number (1661924056144).

Almost surely, 2^{6646589744497} is an apocalyptic number.

It is an amenable number.

6646589744497 is a deficient number, since it is larger than the sum of its proper divisors (1106480079).

6646589744497 is a wasteful number, since it uses less digits than its factorization.

6646589744497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106480078.

The product of its digits is 8778792960, while the sum is 79.

The spelling of 6646589744497 in words is "six trillion, six hundred forty-six billion, five hundred eighty-nine million, seven hundred forty-four thousand, four hundred ninety-seven".