66411966 has 32 divisors (see below), whose sum is σ = 137013408. Its totient is φ = 21444480.

The previous prime is 66411959. The next prime is 66411967. The reversal of 66411966 is 66911466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411967) 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 in 15 ways as a sum of consecutive naturals, for example, 64536 + ... + 65556.

It is an arithmetic number, because the mean of its divisors is an integer number (4281669).

Almost surely, 2^66411966 is an apocalyptic number.

66411966 is an abundant number, since it is smaller than the sum of its proper divisors (70601442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66411966 is a wasteful number, since it uses less digits than its factorization.

66411966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its digits is 46656, while the sum is 39.

The square root of 66411966 is about 8149.3537167066. The cubic root of 66411966 is about 404.9630937258.

Subtracting 66411966 from its reverse (66911466), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 66411966 in words is "sixty-six million, four hundred eleven thousand, nine hundred sixty-six".