66020625 has 90 divisors (see below), whose sum is σ = 132334202. Its totient is φ = 31680000.

The previous prime is 66020623. The next prime is 66020629. The reversal of 66020625 is 52602066.

It can be written as a sum of positive squares in 5 ways, for example, as 27531009 + 38489616 = 5247^2 + 6204^2 .

It is not a de Polignac number, because 66020625 - 2¹ = 66020623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66020621) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 680577 + ... + 680673.

Almost surely, 2^66020625 is an apocalyptic number.

It is an amenable number.

66020625 is an abundant number, since it is smaller than the sum of its proper divisors (66313577).

66020625 is a wasteful number, since it uses less digits than its factorization.

66020625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66020625 is about 8125.3076864818. The cubic root of 66020625 is about 404.1660939282.

The spelling of 66020625 in words is "sixty-six million, twenty thousand, six hundred twenty-five".