6636761 has 4 divisors (see below), whose sum is σ = 6644532. Its totient is φ = 6628992.

The previous prime is 6636709. The next prime is 6636767. The reversal of 6636761 is 1676366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3553225 + 3083536 = 1885^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 6636761 - 2¹⁰ = 6635737 is a prime.

It is a super-2 number, since 2×6636761² = 88093193142242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6636767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2420 + ... + 4373.

It is an arithmetic number, because the mean of its divisors is an integer number (1661133).

Almost surely, 2^6636761 is an apocalyptic number.

It is an amenable number.

6636761 is a deficient number, since it is larger than the sum of its proper divisors (7771).

6636761 is an equidigital number, since it uses as much as digits as its factorization.

6636761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its digits is 27216, while the sum is 35.

The square root of 6636761 is about 2576.1911807938. The cubic root of 6636761 is about 187.9253608191.

The spelling of 6636761 in words is "six million, six hundred thirty-six thousand, seven hundred sixty-one".