51720105012 has 24 divisors (see below), whose sum is σ = 123941874336. Its totient is φ = 16774087968.

The previous prime is 51720105001. The next prime is 51720105061. The reversal of 51720105012 is 21050102715.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58242918 + ... + 58243805.

It is an arithmetic number, because the mean of its divisors is an integer number (5164244764).

Almost surely, 2^51720105012 is an apocalyptic number.

It is an amenable number.

51720105012 is an abundant number, since it is smaller than the sum of its proper divisors (72221769324).

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

51720105012 is a wasteful number, since it uses less digits than its factorization.

51720105012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116486767 (or 116486765 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

Adding to 51720105012 its reverse (21050102715), we get a palindrome (72770207727).

The spelling of 51720105012 in words is "fifty-one billion, seven hundred twenty million, one hundred five thousand, twelve".