6642169 has 2 divisors, whose sum is σ = 6642170. Its totient is φ = 6642168.

The previous prime is 6642151. The next prime is 6642187. The reversal of 6642169 is 9612466.

It is a balanced prime because it is at equal distance from previous prime (6642151) and next prime (6642187).

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 1236544 = 2325^2 + 1112^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642169 - 2⁵ = 6642137 is a prime.

It is a super-2 number, since 2×6642169² = 88236818049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6642109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321084 + 3321085.

It is an arithmetic number, because the mean of its divisors is an integer number (3321085).

Almost surely, 2^6642169 is an apocalyptic number.

It is an amenable number.

6642169 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642169 is an equidigital number, since it uses as much as digits as its factorization.

6642169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 6642169 is about 2577.2405786034. The cubic root of 6642169 is about 187.9763909541.

It can be divided in two parts, 664216 and 9, that added together give a square (664225 = 815²).

The spelling of 6642169 in words is "six million, six hundred forty-two thousand, one hundred sixty-nine".