6631645 has 8 divisors (see below), whose sum is σ = 7981056. Its totient is φ = 5289936.

The previous prime is 6631643. The next prime is 6631661. The reversal of 6631645 is 5461366.

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

It is a cyclic number.

It is not a de Polignac number, because 6631645 - 2¹ = 6631643 is a prime.

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 (6631643) 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, 184 + ... + 3646.

It is an arithmetic number, because the mean of its divisors is an integer number (997632).

Almost surely, 2^6631645 is an apocalyptic number.

It is an amenable number.

6631645 is a deficient number, since it is larger than the sum of its proper divisors (1349411).

6631645 is a wasteful number, since it uses less digits than its factorization.

6631645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851.

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

The square root of 6631645 is about 2575.1980506361. The cubic root of 6631645 is about 187.8770604864.

The spelling of 6631645 in words is "six million, six hundred thirty-one thousand, six hundred forty-five".