51216160720 has 80 divisors (see below), whose sum is σ = 123670633680. Its totient is φ = 19708710912.

The previous prime is 51216160673. The next prime is 51216160741. The reversal of 51216160720 is 2706161215.

It can be written as a sum of positive squares in 8 ways, for example, as 1258546576 + 49957614144 = 35476^2 + 223512^2 .

It is a tau number, because it is divible by the number of its divisors (80).

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, 166234 + ... + 360646.

It is an arithmetic number, because the mean of its divisors is an integer number (1545882921).

Almost surely, 2^51216160720 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 51216160720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61835316840).

51216160720 is an abundant number, since it is smaller than the sum of its proper divisors (72454472960).

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

51216160720 is a wasteful number, since it uses less digits than its factorization.

51216160720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194552 (or 194546 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 51216160720 in words is "fifty-one billion, two hundred sixteen million, one hundred sixty thousand, seven hundred twenty".