6668537 has 2 divisors, whose sum is σ = 6668538. Its totient is φ = 6668536.

The previous prime is 6668531. The next prime is 6668549. The reversal of 6668537 is 7358666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6635776 + 32761 = 2576^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668537 - 2¹⁴ = 6652153 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668494 and 6668503.

It is not a weakly prime, because it can be changed into another prime (6668531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334268 + 3334269.

It is an arithmetic number, because the mean of its divisors is an integer number (3334269).

Almost surely, 2^6668537 is an apocalyptic number.

It is an amenable number.

6668537 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668537 is an equidigital number, since it uses as much as digits as its factorization.

6668537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 6668537 is about 2582.3510605648. The cubic root of 6668537 is about 188.2248046410.

The spelling of 6668537 in words is "six million, six hundred sixty-eight thousand, five hundred thirty-seven".