51605613164420 has 48 divisors (see below), whose sum is σ = 123918418995840. Its totient is φ = 17684074884864.

The previous prime is 51605613164407. The next prime is 51605613164423. The reversal of 51605613164420 is 2446131650615.

It is not an unprimeable number, because it can be changed into a prime (51605613164423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96379985 + ... + 96913944.

It is an arithmetic number, because the mean of its divisors is an integer number (2581633729080).

Almost surely, 2^{51605613164420} is an apocalyptic number.

It is an amenable number.

51605613164420 is an abundant number, since it is smaller than the sum of its proper divisors (72312805831420).

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

51605613164420 is a wasteful number, since it uses less digits than its factorization.

51605613164420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193295852 (or 193295850 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 51605613164420 in words is "fifty-one trillion, six hundred five billion, six hundred thirteen million, one hundred sixty-four thousand, four hundred twenty".