51845220050 has 54 divisors (see below), whose sum is σ = 104462741133. Its totient is φ = 19135122240.

The previous prime is 51845219983. The next prime is 51845220103. The reversal of 51845220050 is 5002254815.

It can be written as a sum of positive squares in 14 ways, for example, as 13272652849 + 38572567201 = 115207^2 + 196399^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=161005.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51845219989 and 51845220016.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20929412 + ... + 20931888.

Almost surely, 2^51845220050 is an apocalyptic number.

51845220050 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51845220050 is an abundant number, since it is smaller than the sum of its proper divisors (52617521083).

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

51845220050 is an equidigital number, since it uses as much as digits as its factorization.

51845220050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Multiplying 51845220050 by its sum of digits (32), we get a square (1659047041600 = 1288040²).

Adding to 51845220050 its reverse (5002254815), we get a palindrome (56847474865).

The spelling of 51845220050 in words is "fifty-one billion, eight hundred forty-five million, two hundred twenty thousand, fifty".