51216512160220 has 96 divisors (see below), whose sum is σ = 120276550598400. Its totient is φ = 18157479436800.

The previous prime is 51216512160181. The next prime is 51216512160221. The reversal of 51216512160220 is 2206121561215.

It is a super-2 number, since 2×51216512160220² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216512160221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11214291 + ... + 15106069.

It is an arithmetic number, because the mean of its divisors is an integer number (1252880735400).

Almost surely, 2^{51216512160220} 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 51216512160220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60138275299200).

51216512160220 is an abundant number, since it is smaller than the sum of its proper divisors (69060038438180).

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

51216512160220 is a wasteful number, since it uses less digits than its factorization.

51216512160220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893299 (or 3893297 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 51216512160220 in words is "fifty-one trillion, two hundred sixteen billion, five hundred twelve million, one hundred sixty thousand, two hundred twenty".