66525940 has 24 divisors (see below), whose sum is σ = 150451560. Its totient is φ = 24563328.

The previous prime is 66525923. The next prime is 66525941. The reversal of 66525940 is 4952566.

It can be written as a sum of positive squares in 4 ways, for example, as 1304164 + 65221776 = 1142^2 + 8076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66525940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525941) 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, 127675 + ... + 128194.

It is an arithmetic number, because the mean of its divisors is an integer number (6268815).

Almost surely, 2^66525940 is an apocalyptic number.

It is an amenable number.

66525940 is an abundant number, since it is smaller than the sum of its proper divisors (83925620).

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

66525940 is a wasteful number, since it uses less digits than its factorization.

66525940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255891 (or 255889 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 66525940 is about 8156.3435435249. The cubic root of 66525940 is about 405.1946227117.

The spelling of 66525940 in words is "sixty-six million, five hundred twenty-five thousand, nine hundred forty".