7066639 has 2 divisors, whose sum is σ = 7066640. Its totient is φ = 7066638.

The previous prime is 7066573. The next prime is 7066643. The reversal of 7066639 is 9366607.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7066639 - 2¹¹ = 7064591 is a prime.

7066639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7066598 and 7066607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7066699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3533319 + 3533320.

It is an arithmetic number, because the mean of its divisors is an integer number (3533320).

Almost surely, 2^7066639 is an apocalyptic number.

7066639 is a deficient number, since it is larger than the sum of its proper divisors (1).

7066639 is an equidigital number, since it uses as much as digits as its factorization.

7066639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 7066639 is about 2658.3150678578. The cubic root of 7066639 is about 191.8982298478.

Subtracting 7066639 from its reverse (9366607), we obtain a cube (2299968 = 132³).

The spelling of 7066639 in words is "seven million, sixty-six thousand, six hundred thirty-nine".