51655858620920 has 128 divisors (see below), whose sum is σ = 118243699430400. Its totient is φ = 20305531008000.

The previous prime is 51655858620911. The next prime is 51655858620923. The reversal of 51655858620920 is 2902685855615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51655858620923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1938511037 + ... + 1938537683.

It is an arithmetic number, because the mean of its divisors is an integer number (923778901800).

Almost surely, 2^{51655858620920} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51655858620920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59121849715200).

51655858620920 is an abundant number, since it is smaller than the sum of its proper divisors (66587840809480).

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

51655858620920 is a wasteful number, since it uses less digits than its factorization.

51655858620920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28909 (or 28905 counting only the distinct ones).

The product of its (nonzero) digits is 51840000, while the sum is 62.

The spelling of 51655858620920 in words is "fifty-one trillion, six hundred fifty-five billion, eight hundred fifty-eight million, six hundred twenty thousand, nine hundred twenty".