51985623729 has 24 divisors (see below), whose sum is σ = 75133241280. Its totient is φ = 31958302272.

The previous prime is 51985623713. The next prime is 51985623731. The reversal of 51985623729 is 92732658915.

It is a happy number.

It is not a de Polignac number, because 51985623729 - 2⁴ = 51985623713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51985623749) 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 23 ways as a sum of consecutive naturals, for example, 446227 + ... + 550535.

It is an arithmetic number, because the mean of its divisors is an integer number (3130551720).

Almost surely, 2^51985623729 is an apocalyptic number.

It is an amenable number.

51985623729 is a deficient number, since it is larger than the sum of its proper divisors (23147617551).

51985623729 is a wasteful number, since it uses less digits than its factorization.

51985623729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105321 (or 105308 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 57.

The spelling of 51985623729 in words is "fifty-one billion, nine hundred eighty-five million, six hundred twenty-three thousand, seven hundred twenty-nine".