66641711 has 2 divisors, whose sum is σ = 66641712. Its totient is φ = 66641710.

The previous prime is 66641677. The next prime is 66641713. The reversal of 66641711 is 11714666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66641711 - 2¹⁴ = 66625327 is a prime.

It is a super-2 number, since 2×66641711² = 8882235290015042, which contains 22 as substring.

Together with 66641713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66641713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33320855 + 33320856.

It is an arithmetic number, because the mean of its divisors is an integer number (33320856).

Almost surely, 2^66641711 is an apocalyptic number.

66641711 is a deficient number, since it is larger than the sum of its proper divisors (1).

66641711 is an equidigital number, since it uses as much as digits as its factorization.

66641711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 66641711 is about 8163.4374499962. The cubic root of 66641711 is about 405.4295315885.

The spelling of 66641711 in words is "sixty-six million, six hundred forty-one thousand, seven hundred eleven".