6635641 has 8 divisors (see below), whose sum is σ = 6792968. Its totient is φ = 6480000.

The previous prime is 6635633. The next prime is 6635659. The reversal of 6635641 is 1465366.

It can be written as a sum of positive squares in 4 ways, for example, as 25600 + 6610041 = 160^2 + 2571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 4-Lehmer number, since φ(6635641) divides (6635641-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 6635641 - 2³ = 6635633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6635611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10741 + ... + 11341.

It is an arithmetic number, because the mean of its divisors is an integer number (849121).

Almost surely, 2^6635641 is an apocalyptic number.

6635641 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6635641 is a deficient number, since it is larger than the sum of its proper divisors (157327).

6635641 is a wasteful number, since it uses less digits than its factorization.

6635641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843.

The product of its digits is 12960, while the sum is 31.

The square root of 6635641 is about 2575.9737964506. The cubic root of 6635641 is about 187.9147889831.

The spelling of 6635641 in words is "six million, six hundred thirty-five thousand, six hundred forty-one".