66525140 has 48 divisors (see below), whose sum is σ = 153667584. Its totient is φ = 23990400.

The previous prime is 66525133. The next prime is 66525143. The reversal of 66525140 is 4152566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525143) 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 15 ways as a sum of consecutive naturals, for example, 26750 + ... + 29130.

It is an arithmetic number, because the mean of its divisors is an integer number (3201408).

Almost surely, 2^66525140 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 66525140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76833792).

66525140 is an abundant number, since it is smaller than the sum of its proper divisors (87142444).

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

66525140 is a wasteful number, since it uses less digits than its factorization.

66525140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 66525140 is about 8156.2945017943. The cubic root of 66525140 is about 405.1929984982.

The spelling of 66525140 in words is "sixty-six million, five hundred twenty-five thousand, one hundred forty".