66605056 has 104 divisors (see below), whose sum is σ = 160412544. Its totient is φ = 27033600.

The previous prime is 66605027. The next prime is 66605057. The reversal of 66605056 is 65050666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659406 + ... + 659506.

Almost surely, 2^66605056 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 66605056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80206272).

66605056 is an abundant number, since it is smaller than the sum of its proper divisors (93807488).

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

66605056 is a wasteful number, since it uses less digits than its factorization.

66605056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 66605056 is about 8161.1920697898. The cubic root of 66605056 is about 405.3551850331.

The spelling of 66605056 in words is "sixty-six million, six hundred five thousand, fifty-six".