6646220013 has 8 divisors (see below), whose sum is σ = 8865951328. Its totient is φ = 4428651024.

The previous prime is 6646220011. The next prime is 6646220027. The reversal of 6646220013 is 3100226466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6646220013 - 2¹ = 6646220011 is a prime.

It is a super-2 number, since 2×6646220013² = 88344480922403440338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646220011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533395 + ... + 545712.

It is an arithmetic number, because the mean of its divisors is an integer number (1108243916).

Almost surely, 2^6646220013 is an apocalyptic number.

It is an amenable number.

6646220013 is a deficient number, since it is larger than the sum of its proper divisors (2219731315).

6646220013 is a wasteful number, since it uses less digits than its factorization.

6646220013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081163.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6646220013 is about 81524.3522697359. The cubic root of 6646220013 is about 1880.1459835523.

Adding to 6646220013 its reverse (3100226466), we get a palindrome (9746446479).

The spelling of 6646220013 in words is "six billion, six hundred forty-six million, two hundred twenty thousand, thirteen".