51220320544 has 24 divisors (see below), whose sum is σ = 106771772268. Its totient is φ = 24103680000.

The previous prime is 51220320539. The next prime is 51220320553. The reversal of 51220320544 is 44502302215.

It can be written as a sum of positive squares in 2 ways, for example, as 49189916944 + 2030403600 = 221788^2 + 45060^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47076957 + ... + 47078044.

Almost surely, 2^51220320544 is an apocalyptic number.

It is an amenable number.

51220320544 is an abundant number, since it is smaller than the sum of its proper divisors (55551451724).

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

51220320544 is a wasteful number, since it uses less digits than its factorization.

51220320544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94155028 (or 94155020 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 51220320544 its reverse (44502302215), we get a palindrome (95722622759).

The spelling of 51220320544 in words is "fifty-one billion, two hundred twenty million, three hundred twenty thousand, five hundred forty-four".