6642817 has 2 divisors, whose sum is σ = 6642818. Its totient is φ = 6642816.

The previous prime is 6642803. The next prime is 6642829. The reversal of 6642817 is 7182466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5456896 + 1185921 = 2336^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642817 - 2¹¹ = 6640769 is a prime.

It is not a weakly prime, because it can be changed into another prime (6642847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321408 + 3321409.

It is an arithmetic number, because the mean of its divisors is an integer number (3321409).

Almost surely, 2^6642817 is an apocalyptic number.

It is an amenable number.

6642817 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642817 is an equidigital number, since it uses as much as digits as its factorization.

6642817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 6642817 is about 2577.3662913913. The cubic root of 6642817 is about 187.9825036532.

It can be divided in two parts, 664 and 2817, that added together give a square (3481 = 59²).

The spelling of 6642817 in words is "six million, six hundred forty-two thousand, eight hundred seventeen".