66155525 has 12 divisors (see below), whose sum is σ = 84862500. Its totient is φ = 51098880.

The previous prime is 66155513. The next prime is 66155527. The reversal of 66155525 is 52555166.

66155525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 14760964 + 51394561 = 3842^2 + 7169^2 .

It is not a de Polignac number, because 66155525 - 2¹² = 66151429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66155527) 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, 44900 + ... + 46349.

It is an arithmetic number, because the mean of its divisors is an integer number (7071875).

Almost surely, 2^66155525 is an apocalyptic number.

It is an amenable number.

66155525 is a deficient number, since it is larger than the sum of its proper divisors (18706975).

66155525 is a wasteful number, since it uses less digits than its factorization.

66155525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91288 (or 91283 counting only the distinct ones).

The product of its digits is 45000, while the sum is 35.

The square root of 66155525 is about 8133.6046744356. The cubic root of 66155525 is about 404.4411842918.

The spelling of 66155525 in words is "sixty-six million, one hundred fifty-five thousand, five hundred twenty-five".