66512605527 has 12 divisors (see below), whose sum is σ = 96775033680. Its totient is φ = 44018073888.

The previous prime is 66512605517. The next prime is 66512605541. The reversal of 66512605527 is 72550621566.

66512605527 is a `hidden beast` number, since 6 + 6 + 5 + 12 + 605 + 5 + 27 = 666.

It is not a de Polignac number, because 66512605527 - 2⁶ = 66512605463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66512605517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26970627 + ... + 26973092.

It is an arithmetic number, because the mean of its divisors is an integer number (8064586140).

Almost surely, 2^66512605527 is an apocalyptic number.

66512605527 is a deficient number, since it is larger than the sum of its proper divisors (30262428153).

66512605527 is a wasteful number, since it uses less digits than its factorization.

66512605527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53943862 (or 53943859 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 66512605527 in words is "sixty-six billion, five hundred twelve million, six hundred five thousand, five hundred twenty-seven".