51553099208520 has 2304 divisors, whose sum is σ = 231133822133760. Its totient is φ = 10207980453888.

The previous prime is 51553099208519. The next prime is 51553099208539. The reversal of 51553099208520 is 2580299035515.

51553099208520 is a `hidden beast` number, since 5 + 1 + 5 + 5 + 3 + 0 + 99 + 20 + 8 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 68101847982 + ... + 68101848738.

It is an arithmetic number, because the mean of its divisors is an integer number (100318499190).

Almost surely, 2^{51553099208520} 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 51553099208520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115566911066880).

51553099208520 is an abundant number, since it is smaller than the sum of its proper divisors (179580722925240).

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

51553099208520 is a wasteful number, since it uses less digits than its factorization.

51553099208520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 51553099208520 in words is "fifty-one trillion, five hundred fifty-three billion, ninety-nine million, two hundred eight thousand, five hundred twenty".