66541525 has 6 divisors (see below), whose sum is σ = 82511522. Its totient is φ = 53233200.

The previous prime is 66541513. The next prime is 66541537. The reversal of 66541525 is 52514566.

It is an interprime number because it is at equal distance from previous prime (66541513) and next prime (66541537).

It can be written as a sum of positive squares in 3 ways, for example, as 21288996 + 45252529 = 4614^2 + 6727^2 .

It is not a de Polignac number, because 66541525 - 2⁵ = 66541493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1330806 + ... + 1330855.

Almost surely, 2^66541525 is an apocalyptic number.

It is an amenable number.

66541525 is a deficient number, since it is larger than the sum of its proper divisors (15969997).

66541525 is a wasteful number, since it uses less digits than its factorization.

66541525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661671 (or 2661666 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 66541525 is about 8157.2988789182. The cubic root of 66541525 is about 405.2262618243.

The spelling of 66541525 in words is "sixty-six million, five hundred forty-one thousand, five hundred twenty-five".