6661469 has 4 divisors (see below), whose sum is σ = 6752796. Its totient is φ = 6570144.

The previous prime is 6661441. The next prime is 6661477. The reversal of 6661469 is 9641666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9641666 = 2 ⋅4820833.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 925444 = 2395^2 + 962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661469 is a prime.

It is a super-2 number, since 2×6661469² = 88750338475922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45554 + ... + 45699.

It is an arithmetic number, because the mean of its divisors is an integer number (1688199).

Almost surely, 2^6661469 is an apocalyptic number.

It is an amenable number.

6661469 is a deficient number, since it is larger than the sum of its proper divisors (91327).

6661469 is an equidigital number, since it uses as much as digits as its factorization.

6661469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91326.

The product of its digits is 46656, while the sum is 38.

The square root of 6661469 is about 2580.9821773891. The cubic root of 6661469 is about 188.1582811433.

The spelling of 6661469 in words is "six million, six hundred sixty-one thousand, four hundred sixty-nine".