66966061 has 4 divisors (see below), whose sum is σ = 67076992. Its totient is φ = 66855132.

The previous prime is 66966049. The next prime is 66966073. The reversal of 66966061 is 16066966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16066966 = 2 ⋅8033483.

It is an interprime number because it is at equal distance from previous prime (66966049) and next prime (66966073).

It is a cyclic number.

It is not a de Polignac number, because 66966061 - 2¹¹ = 66964013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66966661) 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 3 ways as a sum of consecutive naturals, for example, 54555 + ... + 55768.

It is an arithmetic number, because the mean of its divisors is an integer number (16769248).

Almost surely, 2^66966061 is an apocalyptic number.

It is an amenable number.

66966061 is a deficient number, since it is larger than the sum of its proper divisors (110931).

66966061 is a wasteful number, since it uses less digits than its factorization.

66966061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110930.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66966061 is about 8183.2793548797. The cubic root of 66966061 is about 406.0862189188.

The spelling of 66966061 in words is "sixty-six million, nine hundred sixty-six thousand, sixty-one".