66704413594729 has 9 divisors (see below), whose sum is σ = 69730897160253. Its totient is φ = 63804042019212.

The previous prime is 66704413594717. The next prime is 66704413594751. The reversal of 66704413594729 is 92749531440766.

The square root of 66704413594729 is 8167277.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 66704413594729 - 2⁵ = 66704413594697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66704413598729) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 187669822 + ... + 188024920.

Almost surely, 2^{66704413594729} is an apocalyptic number.

66704413594729 is the 8167277-th square number.

66704413594729 is the 4083639-th centered octagonal number.

It is an amenable number.

66704413594729 is a deficient number, since it is larger than the sum of its proper divisors (3026483565524).

66704413594729 is an frugal number, since it uses more digits than its factorization.

66704413594729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710244 (or 355122 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 67.

The spelling of 66704413594729 in words is "sixty-six trillion, seven hundred four billion, four hundred thirteen million, five hundred ninety-four thousand, seven hundred twenty-nine".