66740074729 has 8 divisors (see below), whose sum is σ = 68014941192. Its totient is φ = 65465786880.

The previous prime is 66740074691. The next prime is 66740074759. The reversal of 66740074729 is 92747004766.

It can be written as a sum of positive squares in 4 ways, for example, as 12940200025 + 53799874704 = 113755^2 + 231948^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66740074729 - 2¹¹ = 66740072681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66740074759) 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 7 ways as a sum of consecutive naturals, for example, 91897 + ... + 376729.

It is an arithmetic number, because the mean of its divisors is an integer number (8501867649).

Almost surely, 2^66740074729 is an apocalyptic number.

It is an amenable number.

66740074729 is a deficient number, since it is larger than the sum of its proper divisors (1274866463).

66740074729 is a wasteful number, since it uses less digits than its factorization.

66740074729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289307.

The product of its (nonzero) digits is 3556224, while the sum is 52.

The spelling of 66740074729 in words is "sixty-six billion, seven hundred forty million, seventy-four thousand, seven hundred twenty-nine".