66566707 has 2 divisors, whose sum is σ = 66566708. Its totient is φ = 66566706.

The previous prime is 66566693. The next prime is 66566719. The reversal of 66566707 is 70766566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66566707 - 2¹⁹ = 66042419 is a prime.

It is a super-2 number, since 2×66566707² = 8862252961647698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66561707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283353 + 33283354.

It is an arithmetic number, because the mean of its divisors is an integer number (33283354).

Almost surely, 2^66566707 is an apocalyptic number.

66566707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566707 is an equidigital number, since it uses as much as digits as its factorization.

66566707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 66566707 is about 8158.8422585561. The cubic root of 66566707 is about 405.2773733708.

The spelling of 66566707 in words is "sixty-six million, five hundred sixty-six thousand, seven hundred seven".