6665537 has 2 divisors, whose sum is σ = 6665538. Its totient is φ = 6665536.

The previous prime is 6665497. The next prime is 6665539. The reversal of 6665537 is 7355666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5683456 + 982081 = 2384^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665537 - 2¹⁰ = 6664513 is a prime.

Together with 6665539, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6665537.

It is not a weakly prime, because it can be changed into another prime (6665539) 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 as a sum of consecutive naturals, namely, 3332768 + 3332769.

It is an arithmetic number, because the mean of its divisors is an integer number (3332769).

Almost surely, 2^6665537 is an apocalyptic number.

It is an amenable number.

6665537 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665537 is an equidigital number, since it uses as much as digits as its factorization.

6665537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 38.

The square root of 6665537 is about 2581.7701291943. The cubic root of 6665537 is about 188.1965746054.

The spelling of 6665537 in words is "six million, six hundred sixty-five thousand, five hundred thirty-seven".