51663340220 has 24 divisors (see below), whose sum is σ = 109567207008. Its totient is φ = 20460728000.

The previous prime is 51663340217. The next prime is 51663340259. The reversal of 51663340220 is 2204336615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12785936 + ... + 12789975.

It is an arithmetic number, because the mean of its divisors is an integer number (4565300292).

Almost surely, 2^51663340220 is an apocalyptic number.

It is an amenable number.

51663340220 is an abundant number, since it is smaller than the sum of its proper divisors (57903866788).

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

51663340220 is a wasteful number, since it uses less digits than its factorization.

51663340220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25576021 (or 25576019 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 51663340220 its reverse (2204336615), we get a palindrome (53867676835).

The spelling of 51663340220 in words is "fifty-one billion, six hundred sixty-three million, three hundred forty thousand, two hundred twenty".