51520402220 has 72 divisors (see below), whose sum is σ = 125899636464. Its totient is φ = 17658152064.

The previous prime is 51520402217. The next prime is 51520402253. The reversal of 51520402220 is 2220402515.

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, 3651299 + ... + 3665381.

It is an arithmetic number, because the mean of its divisors is an integer number (1748606062).

Almost surely, 2^51520402220 is an apocalyptic number.

It is an amenable number.

51520402220 is an abundant number, since it is smaller than the sum of its proper divisors (74379234244).

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

51520402220 is a wasteful number, since it uses less digits than its factorization.

51520402220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17839 (or 17830 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 51520402220 its reverse (2220402515), we get a palindrome (53740804735).

The spelling of 51520402220 in words is "fifty-one billion, five hundred twenty million, four hundred two thousand, two hundred twenty".