66753959659 has 4 divisors (see below), whose sum is σ = 66808276560. Its totient is φ = 66699642760.

The previous prime is 66753959651. The next prime is 66753959677. The reversal of 66753959659 is 95695935766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66753959659 - 2³ = 66753959651 is a prime.

It is a super-2 number, since 2×66753959659² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66753959651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27156607 + ... + 27159064.

It is an arithmetic number, because the mean of its divisors is an integer number (16702069140).

Almost surely, 2^66753959659 is an apocalyptic number.

66753959659 is a deficient number, since it is larger than the sum of its proper divisors (54316901).

66753959659 is a wasteful number, since it uses less digits than its factorization.

66753959659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54316900.

The product of its digits is 413343000, while the sum is 70.

The spelling of 66753959659 in words is "sixty-six billion, seven hundred fifty-three million, nine hundred fifty-nine thousand, six hundred fifty-nine".