51255021250 has 80 divisors (see below), whose sum is σ = 103393947096. Its totient is φ = 18979200000.

The previous prime is 51255021247. The next prime is 51255021263. The reversal of 51255021250 is 5212055215.

It can be written as a sum of positive squares in 20 ways, for example, as 43975348209 + 7279673041 = 209703^2 + 85321^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1276480 + ... + 1316020.

Almost surely, 2^51255021250 is an apocalyptic number.

51255021250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51255021250 is an abundant number, since it is smaller than the sum of its proper divisors (52138925846).

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

51255021250 is a wasteful number, since it uses less digits than its factorization.

51255021250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39641 (or 39626 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

Adding to 51255021250 its reverse (5212055215), we get a palindrome (56467076465).

The spelling of 51255021250 in words is "fifty-one billion, two hundred fifty-five million, twenty-one thousand, two hundred fifty".