51115562250 has 256 divisors, whose sum is σ = 140908584960. Its totient is φ = 12284236800.

The previous prime is 51115562249. The next prime is 51115562261. The reversal of 51115562250 is 5226551115.

It is a super-2 number, since 2×51115562250² (a number of 22 digits) contains 22 as substring.

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 127 ways as a sum of consecutive naturals, for example, 86197954 + ... + 86198546.

It is an arithmetic number, because the mean of its divisors is an integer number (550424160).

Almost surely, 2^51115562250 is an apocalyptic number.

51115562250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51115562250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70454292480).

51115562250 is an abundant number, since it is smaller than the sum of its proper divisors (89793022710).

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

51115562250 is a wasteful number, since it uses less digits than its factorization.

51115562250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 51115562250 in words is "fifty-one billion, one hundred fifteen million, five hundred sixty-two thousand, two hundred fifty".