66436525 has 6 divisors (see below), whose sum is σ = 82381322. Its totient is φ = 53149200.

The previous prime is 66436501. The next prime is 66436553. The reversal of 66436525 is 52563466.

It can be written as a sum of positive squares in 3 ways, for example, as 842724 + 65593801 = 918^2 + 8099^2 .

It is not a de Polignac number, because 66436525 - 2¹¹ = 66434477 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, 1328706 + ... + 1328755.

Almost surely, 2^66436525 is an apocalyptic number.

It is an amenable number.

66436525 is a deficient number, since it is larger than the sum of its proper divisors (15944797).

66436525 is a wasteful number, since it uses less digits than its factorization.

66436525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657471 (or 2657466 counting only the distinct ones).

The product of its digits is 129600, while the sum is 37.

The square root of 66436525 is about 8150.8603840331. The cubic root of 66436525 is about 405.0130057298.

The spelling of 66436525 in words is "sixty-six million, four hundred thirty-six thousand, five hundred twenty-five".