51317327620 has 96 divisors (see below), whose sum is σ = 122338339200. Its totient is φ = 17925110784.

The previous prime is 51317327591. The next prime is 51317327641. The reversal of 51317327620 is 2672371315.

It is a super-2 number, since 2×51317327620² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51317327620.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3643632 + ... + 3657688.

It is an arithmetic number, because the mean of its divisors is an integer number (1274357700).

Almost surely, 2^51317327620 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 51317327620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61169169600).

51317327620 is an abundant number, since it is smaller than the sum of its proper divisors (71021011580).

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

51317327620 is a wasteful number, since it uses less digits than its factorization.

51317327620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14837 (or 14835 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 37.

Adding to 51317327620 its reverse (2672371315), we get a palindrome (53989698935).

The spelling of 51317327620 in words is "fifty-one billion, three hundred seventeen million, three hundred twenty-seven thousand, six hundred twenty".