51512223204 has 72 divisors (see below), whose sum is σ = 140571096120. Its totient is φ = 15811103232.

The previous prime is 51512223193. The next prime is 51512223307. The reversal of 51512223204 is 40232221515.

51512223204 is a `hidden beast` number, since 515 + 122 + 2 + 3 + 20 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5373183204 + 46139040000 = 73302^2 + 214800^2 .

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, 56854 + ... + 325970.

It is an arithmetic number, because the mean of its divisors is an integer number (1952376335).

Almost surely, 2^51512223204 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 51512223204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70285548060).

51512223204 is an abundant number, since it is smaller than the sum of its proper divisors (89058872916).

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

51512223204 is a wasteful number, since it uses less digits than its factorization.

51512223204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269549 (or 269544 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 51512223204 its reverse (40232221515), we get a palindrome (91744444719).

The spelling of 51512223204 in words is "fifty-one billion, five hundred twelve million, two hundred twenty-three thousand, two hundred four".