66753071749 has 16 divisors (see below), whose sum is σ = 82172793472. Its totient is φ = 52805867328.

The previous prime is 66753071717. The next prime is 66753071753. The reversal of 66753071749 is 94717035766.

It is a cyclic number.

It is not a de Polignac number, because 66753071749 - 2⁵ = 66753071717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66753071749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66753071789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449542 + ... + 579304.

It is an arithmetic number, because the mean of its divisors is an integer number (5135799592).

Almost surely, 2^66753071749 is an apocalyptic number.

It is an amenable number.

66753071749 is a deficient number, since it is larger than the sum of its proper divisors (15419721723).

66753071749 is a wasteful number, since it uses less digits than its factorization.

66753071749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135436.

The product of its (nonzero) digits is 6667920, while the sum is 55.

It can be divided in two parts, 6675307 and 1749, that added together give a square (6677056 = 2584²).

The spelling of 66753071749 in words is "sixty-six billion, seven hundred fifty-three million, seventy-one thousand, seven hundred forty-nine".