66136664 has 48 divisors (see below), whose sum is σ = 144358200. Its totient is φ = 28286720.

The previous prime is 66136657. The next prime is 66136669. The reversal of 66136664 is 46663166.

66136664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66136669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14447 + ... + 18465.

Almost surely, 2^66136664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66136664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72179100).

66136664 is an abundant number, since it is smaller than the sum of its proper divisors (78221536).

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

66136664 is a wasteful number, since it uses less digits than its factorization.

66136664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064 (or 4049 counting only the distinct ones).

The product of its digits is 93312, while the sum is 38.

The square root of 66136664 is about 8132.4451427600. The cubic root of 66136664 is about 404.4027451228.

The spelling of 66136664 in words is "sixty-six million, one hundred thirty-six thousand, six hundred sixty-four".