6642669 has 16 divisors (see below), whose sum is σ = 9762624. Its totient is φ = 3984000.

The previous prime is 6642659. The next prime is 6642707. The reversal of 6642669 is 9662466.

It is not a de Polignac number, because 6642669 - 2⁵ = 6642637 is a prime.

It is a super-2 number, since 2×6642669² = 88250102887122, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 6⁴ + 4⁵ + 2¹⁷ + 6⁶ + 6⁸ + 9⁷ .

6642669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2337 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (610164).

Almost surely, 2^6642669 is an apocalyptic number.

It is an amenable number.

6642669 is a deficient number, since it is larger than the sum of its proper divisors (3119955).

6642669 is a wasteful number, since it uses less digits than its factorization.

6642669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its digits is 93312, while the sum is 39.

The square root of 6642669 is about 2577.3375797516. The cubic root of 6642669 is about 187.9811075779.

It can be divided in two parts, 664 and 2669, that added together give a palindrome (3333).

The spelling of 6642669 in words is "six million, six hundred forty-two thousand, six hundred sixty-nine".