6644537 has 2 divisors, whose sum is σ = 6644538. Its totient is φ = 6644536.

The previous prime is 6644527. The next prime is 6644543. The reversal of 6644537 is 7354466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5067001 + 1577536 = 2251^2 + 1256^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644537 - 2¹⁰ = 6643513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6644497 and 6644506.

It is not a weakly prime, because it can be changed into another prime (6644527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322268 + 3322269.

It is an arithmetic number, because the mean of its divisors is an integer number (3322269).

Almost surely, 2^6644537 is an apocalyptic number.

It is an amenable number.

6644537 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644537 is an equidigital number, since it uses as much as digits as its factorization.

6644537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 6644537 is about 2577.6999437483. The cubic root of 6644537 is about 187.9987267908.

The spelling of 6644537 in words is "six million, six hundred forty-four thousand, five hundred thirty-seven".