66280525 has 12 divisors (see below), whose sum is σ = 83114100. Its totient is φ = 52426880.

The previous prime is 66280523. The next prime is 66280547. The reversal of 66280525 is 52508266.

It can be written as a sum of positive squares in 6 ways, for example, as 21511044 + 44769481 = 4638^2 + 6691^2 .

It is not a de Polignac number, because 66280525 - 2¹ = 66280523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66280523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12670 + ... + 17119.

It is an arithmetic number, because the mean of its divisors is an integer number (6926175).

Almost surely, 2^66280525 is an apocalyptic number.

It is an amenable number.

66280525 is a deficient number, since it is larger than the sum of its proper divisors (16833575).

66280525 is a wasteful number, since it uses less digits than its factorization.

66280525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29888 (or 29883 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 66280525 is about 8141.2852179493. The cubic root of 66280525 is about 404.6957528020.

The spelling of 66280525 in words is "sixty-six million, two hundred eighty thousand, five hundred twenty-five".