51251141520 has 120 divisors (see below), whose sum is σ = 172727295936. Its totient is φ = 13618623744.

The previous prime is 51251141507. The next prime is 51251141621. The reversal of 51251141520 is 2514115215.

It is a happy number.

51251141520 is a `hidden beast` number, since 5 + 1 + 25 + 114 + 1 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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, 77997 + ... + 329523.

Almost surely, 2^51251141520 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 51251141520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86363647968).

51251141520 is an abundant number, since it is smaller than the sum of its proper divisors (121476154416).

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

51251141520 is a wasteful number, since it uses less digits than its factorization.

51251141520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251829 (or 251820 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 51251141520 its reverse (2514115215), we get a palindrome (53765256735).

The spelling of 51251141520 in words is "fifty-one billion, two hundred fifty-one million, one hundred forty-one thousand, five hundred twenty".