66675520 has 56 divisors (see below), whose sum is σ = 160020000. Its totient is φ = 26460672.

The previous prime is 66675509. The next prime is 66675523. The reversal of 66675520 is 2557666.

66675520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66675520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66675523) 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 7 ways as a sum of consecutive naturals, for example, 43731 + ... + 45229.

It is an arithmetic number, because the mean of its divisors is an integer number (2857500).

Almost surely, 2^66675520 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 66675520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80010000).

66675520 is an abundant number, since it is smaller than the sum of its proper divisors (93344480).

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

66675520 is a wasteful number, since it uses less digits than its factorization.

66675520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 66675520 is about 8165.5079450087. The cubic root of 66675520 is about 405.4980814976.

The spelling of 66675520 in words is "sixty-six million, six hundred seventy-five thousand, five hundred twenty".