51636216625 has 16 divisors (see below), whose sum is σ = 73647999360. Its totient is φ = 35407690800.

The previous prime is 51636216623. The next prime is 51636216637. The reversal of 51636216625 is 52661263615.

It is not a de Polignac number, because 51636216625 - 2¹ = 51636216623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51636216623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29505535 + ... + 29507284.

It is an arithmetic number, because the mean of its divisors is an integer number (4602999960).

Almost surely, 2^51636216625 is an apocalyptic number.

It is an amenable number.

51636216625 is a deficient number, since it is larger than the sum of its proper divisors (22011782735).

51636216625 is an equidigital number, since it uses as much as digits as its factorization.

51636216625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59012841 (or 59012831 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The spelling of 51636216625 in words is "fifty-one billion, six hundred thirty-six million, two hundred sixteen thousand, six hundred twenty-five".