66412061 has 8 divisors (see below), whose sum is σ = 67564800. Its totient is φ = 65267280.

The previous prime is 66412057. The next prime is 66412069. The reversal of 66412061 is 16021466.

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 66412061 - 2² = 66412057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66412061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66412069) 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, 16256 + ... + 19926.

It is an arithmetic number, because the mean of its divisors is an integer number (8445600).

Almost surely, 2^66412061 is an apocalyptic number.

It is an amenable number.

66412061 is a deficient number, since it is larger than the sum of its proper divisors (1152739).

66412061 is a wasteful number, since it uses less digits than its factorization.

66412061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 66412061 is about 8149.3595453876. The cubic root of 66412061 is about 404.9632868209.

The spelling of 66412061 in words is "sixty-six million, four hundred twelve thousand, sixty-one".