666910537 has 2 divisors, whose sum is σ = 666910538. Its totient is φ = 666910536.

The previous prime is 666910513. The next prime is 666910567. The reversal of 666910537 is 735019666.

666910537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660438601 + 6471936 = 25699^2 + 2544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666910537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666910493 and 666910502.

It is not a weakly prime, because it can be changed into another prime (666910567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333455268 + 333455269.

It is an arithmetic number, because the mean of its divisors is an integer number (333455269).

Almost surely, 2^666910537 is an apocalyptic number.

It is an amenable number.

666910537 is a deficient number, since it is larger than the sum of its proper divisors (1).

666910537 is an equidigital number, since it uses as much as digits as its factorization.

666910537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 666910537 is about 25824.6110716115. The cubic root of 666910537 is about 873.6869719299.

The spelling of 666910537 in words is "six hundred sixty-six million, nine hundred ten thousand, five hundred thirty-seven".