51459947980 has 72 divisors (see below), whose sum is σ = 125896610448. Its totient is φ = 17617122432.

The previous prime is 51459947887. The next prime is 51459947983. The reversal of 51459947980 is 8974995415.

It is a super-2 number, since 2×51459947980² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51459947983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 624679 + ... + 702241.

It is an arithmetic number, because the mean of its divisors is an integer number (1748564034).

Almost surely, 2^51459947980 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 51459947980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62948305224).

51459947980 is an abundant number, since it is smaller than the sum of its proper divisors (74436662468).

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

51459947980 is a wasteful number, since it uses less digits than its factorization.

51459947980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78263 (or 78254 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 61.

The spelling of 51459947980 in words is "fifty-one billion, four hundred fifty-nine million, nine hundred forty-seven thousand, nine hundred eighty".