51664730329 has 16 divisors (see below), whose sum is σ = 54632309760. Its totient is φ = 48760954000.

The previous prime is 51664730321. The next prime is 51664730333. The reversal of 51664730329 is 92303746615.

51664730329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51664730329 - 2³ = 51664730321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664730321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 575892 + ... + 659530.

It is an arithmetic number, because the mean of its divisors is an integer number (3414519360).

Almost surely, 2^51664730329 is an apocalyptic number.

It is an amenable number.

51664730329 is a deficient number, since it is larger than the sum of its proper divisors (2967579431).

51664730329 is a wasteful number, since it uses less digits than its factorization.

51664730329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84020.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 51664730329 in words is "fifty-one billion, six hundred sixty-four million, seven hundred thirty thousand, three hundred twenty-nine".