331128620550 has 648 divisors, whose sum is σ = 1186752978216. Its totient is φ = 65742243840.

The previous prime is 331128620519. The next prime is 331128620569. The reversal of 331128620550 is 55026821133.

331128620550 is a `hidden beast` number, since 3 + 3 + 1 + 1 + 2 + 86 + 20 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 323 ways as a sum of consecutive naturals, for example, 63347037 + ... + 63352263.

It is an arithmetic number, because the mean of its divisors is an integer number (1831408917).

Almost surely, 2^331128620550 is an apocalyptic number.

331128620550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 331128620550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593376489108).

331128620550 is an abundant number, since it is smaller than the sum of its proper divisors (855624357666).

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

331128620550 is a wasteful number, since it uses less digits than its factorization.

331128620550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302 (or 5274 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 331128620550 in words is "three hundred thirty-one billion, one hundred twenty-eight million, six hundred twenty thousand, five hundred fifty".