51520050000 has 300 divisors, whose sum is σ = 186395187132. Its totient is φ = 13737600000.

The previous prime is 51520049993. The next prime is 51520050041. The reversal of 51520050000 is 5002515.

It can be written as a sum of positive squares in 6 ways, for example, as 32894351424 + 18625698576 = 181368^2 + 136476^2 .

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4043640 + ... + 4056360.

Almost surely, 2^51520050000 is an apocalyptic number.

51520050000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520050000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93197593566).

51520050000 is an abundant number, since it is smaller than the sum of its proper divisors (134875137132).

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

51520050000 is an equidigital number, since it uses as much as digits as its factorization.

51520050000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12766 (or 12731 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

Adding to 51520050000 its reverse (5002515), we get a palindrome (51525052515).

The spelling of 51520050000 in words is "fifty-one billion, five hundred twenty million, fifty thousand".