66635712575 has 12 divisors (see below), whose sum is σ = 82632914280. Its totient is φ = 53305582560.

The previous prime is 66635712571. The next prime is 66635712587. The reversal of 66635712575 is 57521753666.

It is not a de Polignac number, because 66635712575 - 2² = 66635712571 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66635712571) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 453596 + ... + 582254.

It is an arithmetic number, because the mean of its divisors is an integer number (6886076190).

Almost surely, 2^66635712575 is an apocalyptic number.

66635712575 is a deficient number, since it is larger than the sum of its proper divisors (15997201705).

66635712575 is a wasteful number, since it uses less digits than its factorization.

66635712575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149386 (or 149381 counting only the distinct ones).

The product of its digits is 7938000, while the sum is 53.

The spelling of 66635712575 in words is "sixty-six billion, six hundred thirty-five million, seven hundred twelve thousand, five hundred seventy-five".