66352525 has 12 divisors (see below), whose sum is σ = 82881972. Its totient is φ = 52691840.

The previous prime is 66352523. The next prime is 66352577. The reversal of 66352525 is 52525366.

It can be written as a sum of positive squares in 6 ways, for example, as 2815684 + 63536841 = 1678^2 + 7971^2 .

It is not a de Polignac number, because 66352525 - 2¹ = 66352523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66352523) 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, 6262 + ... + 13111.

It is an arithmetic number, because the mean of its divisors is an integer number (6906831).

Almost surely, 2^66352525 is an apocalyptic number.

It is an amenable number.

66352525 is a deficient number, since it is larger than the sum of its proper divisors (16529447).

66352525 is a wasteful number, since it uses less digits than its factorization.

66352525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520 (or 19515 counting only the distinct ones).

The product of its digits is 54000, while the sum is 34.

The square root of 66352525 is about 8145.7059239823. The cubic root of 66352525 is about 404.8422390172.

The spelling of 66352525 in words is "sixty-six million, three hundred fifty-two thousand, five hundred twenty-five".