66711766 has 16 divisors (see below), whose sum is σ = 110796480. Its totient is φ = 29870280.

The previous prime is 66711763. The next prime is 66711769.

66711766 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66711763) and next prime (66711769).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66711763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21156 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (6924780).

Almost surely, 2^66711766 is an apocalyptic number.

66711766 is a deficient number, since it is larger than the sum of its proper divisors (44084714).

66711766 is a wasteful number, since it uses less digits than its factorization.

66711766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45339.

The product of its digits is 63504, while the sum is 40.

The square root of 66711766 is about 8167.7271012198. The cubic root of 66711766 is about 405.5715468462.

The spelling of 66711766 in words is "sixty-six million, seven hundred eleven thousand, seven hundred sixty-six".