66698711 has 2 divisors, whose sum is σ = 66698712. Its totient is φ = 66698710.

The previous prime is 66698707. The next prime is 66698743. The reversal of 66698711 is 11789666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66698711 - 2² = 66698707 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66698761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33349355 + 33349356.

It is an arithmetic number, because the mean of its divisors is an integer number (33349356).

Almost surely, 2^66698711 is an apocalyptic number.

66698711 is a deficient number, since it is larger than the sum of its proper divisors (1).

66698711 is an equidigital number, since it uses as much as digits as its factorization.

66698711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 66698711 is about 8166.9278801762. The cubic root of 66698711 is about 405.5450893346.

The spelling of 66698711 in words is "sixty-six million, six hundred ninety-eight thousand, seven hundred eleven".