66434525 has 6 divisors (see below), whose sum is σ = 82378842. Its totient is φ = 53147600.

The previous prime is 66434513. The next prime is 66434549. The reversal of 66434525 is 52543466.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 597529 + 65836996 = 773^2 + 8114^2 .

It is not a de Polignac number, because 66434525 - 2⁴ = 66434509 is a prime.

It is a super-2 number, since 2×66434525² = 8827092223951250, which contains 22 as substring.

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, 1328666 + ... + 1328715.

It is an arithmetic number, because the mean of its divisors is an integer number (13729807).

Almost surely, 2^66434525 is an apocalyptic number.

It is an amenable number.

66434525 is a deficient number, since it is larger than the sum of its proper divisors (15944317).

66434525 is a wasteful number, since it uses less digits than its factorization.

66434525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657391 (or 2657386 counting only the distinct ones).

The product of its digits is 86400, while the sum is 35.

The square root of 66434525 is about 8150.7376966751. The cubic root of 66434525 is about 405.0089415290.

The spelling of 66434525 in words is "sixty-six million, four hundred thirty-four thousand, five hundred twenty-five".