51518798321 has 8 divisors (see below), whose sum is σ = 51730519104. Its totient is φ = 51307198000.

The previous prime is 51518798311. The next prime is 51518798339. The reversal of 51518798321 is 12389781515.

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 51518798321 - 2⁶ = 51518798257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51518798321.

It is not an unprimeable number, because it can be changed into a prime (51518798311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883571 + ... + 940071.

It is an arithmetic number, because the mean of its divisors is an integer number (6466314888).

Almost surely, 2^51518798321 is an apocalyptic number.

It is an amenable number.

51518798321 is a deficient number, since it is larger than the sum of its proper divisors (211720783).

51518798321 is a wasteful number, since it uses less digits than its factorization.

51518798321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60231.

The product of its digits is 604800, while the sum is 50.

The spelling of 51518798321 in words is "fifty-one billion, five hundred eighteen million, seven hundred ninety-eight thousand, three hundred twenty-one".