51605744100220 has 24 divisors (see below), whose sum is σ = 109366301721600. Its totient is φ = 20452918761792.

The previous prime is 51605744100217. The next prime is 51605744100301. The reversal of 51605744100220 is 2200144750615.

It is a self number, because there is not a number n which added to its sum of digits gives 51605744100220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11836177660 + ... + 11836182019.

It is an arithmetic number, because the mean of its divisors is an integer number (4556929238400).

Almost surely, 2^{51605744100220} is an apocalyptic number.

It is an amenable number.

51605744100220 is an abundant number, since it is smaller than the sum of its proper divisors (57760557621380).

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

51605744100220 is a wasteful number, since it uses less digits than its factorization.

51605744100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23672359797 (or 23672359795 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

Adding to 51605744100220 its reverse (2200144750615), we get a palindrome (53805888850835).

The spelling of 51605744100220 in words is "fifty-one trillion, six hundred five billion, seven hundred forty-four million, one hundred thousand, two hundred twenty".