51720201016 has 64 divisors (see below), whose sum is σ = 111721317120. Its totient is φ = 22216043520.

The previous prime is 51720200999. The next prime is 51720201037. The reversal of 51720201016 is 61010202715.

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, 14056 + ... + 321928.

It is an arithmetic number, because the mean of its divisors is an integer number (1745645580).

Almost surely, 2^51720201016 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 51720201016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55860658560).

51720201016 is an abundant number, since it is smaller than the sum of its proper divisors (60001116104).

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

51720201016 is a wasteful number, since it uses less digits than its factorization.

51720201016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307996 (or 307992 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 51720201016 in words is "fifty-one billion, seven hundred twenty million, two hundred one thousand, sixteen".