66000061 has 8 divisors (see below), whose sum is σ = 67314240. Its totient is φ = 64699008.

The previous prime is 66000049. The next prime is 66000071. The reversal of 66000061 is 16000066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66000061 - 2⁵ = 66000029 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 (66000071) 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, 7200 + ... + 13558.

It is an arithmetic number, because the mean of its divisors is an integer number (8414280).

Almost surely, 2^66000061 is an apocalyptic number.

It is an amenable number.

66000061 is a deficient number, since it is larger than the sum of its proper divisors (1314179).

66000061 is a wasteful number, since it uses less digits than its factorization.

66000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 66000061 is about 8124.0421589256. The cubic root of 66000061 is about 404.1241265650.

The spelling of 66000061 in words is "sixty-six million, sixty-one", and thus it is an aban number and an uban number.