51239302320 has 160 divisors (see below), whose sum is σ = 164129495040. Its totient is φ = 13209845760.

The previous prime is 51239302313. The next prime is 51239302337. The reversal of 51239302320 is 2320393215.

It is a Cunningham number, because it is equal to 226361²-1.

It is a super-2 number, since 2×51239302320² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9051651 + ... + 9057309.

It is an arithmetic number, because the mean of its divisors is an integer number (1025809344).

Almost surely, 2^51239302320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51239302320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82064747520).

51239302320 is an abundant number, since it is smaller than the sum of its proper divisors (112890192720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51239302320 is a wasteful number, since it uses less digits than its factorization.

51239302320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923 (or 6917 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 51239302320 its reverse (2320393215), we get a palindrome (53559695535).

The spelling of 51239302320 in words is "fifty-one billion, two hundred thirty-nine million, three hundred two thousand, three hundred twenty".