51600720820 has 72 divisors (see below), whose sum is σ = 119559752928. Its totient is φ = 18552441600.

The previous prime is 51600720803. The next prime is 51600720839. The reversal of 51600720820 is 2802700615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727815 + ... + 1757425.

It is an arithmetic number, because the mean of its divisors is an integer number (1660552124).

Almost surely, 2^51600720820 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 51600720820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59779876464).

51600720820 is an abundant number, since it is smaller than the sum of its proper divisors (67959032108).

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

51600720820 is a wasteful number, since it uses less digits than its factorization.

51600720820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29809 (or 29718 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 51600720820 in words is "fifty-one billion, six hundred million, seven hundred twenty thousand, eight hundred twenty".