51320312544 has 96 divisors (see below), whose sum is σ = 135497335680. Its totient is φ = 17007754752.

The previous prime is 51320312531. The next prime is 51320312569. The reversal of 51320312544 is 44521302315.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×51320312544³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23294547 + ... + 23296749.

It is an arithmetic number, because the mean of its divisors is an integer number (1411430580).

Almost surely, 2^51320312544 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 51320312544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67748667840).

51320312544 is an abundant number, since it is smaller than the sum of its proper divisors (84177023136).

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

51320312544 is a wasteful number, since it uses less digits than its factorization.

51320312544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 51320312544 its reverse (44521302315), we get a palindrome (95841614859).

The spelling of 51320312544 in words is "fifty-one billion, three hundred twenty million, three hundred twelve thousand, five hundred forty-four".