53121757500 has 360 divisors, whose sum is σ = 200208975120. Its totient is φ = 12141360000.

The previous prime is 53121757477. The next prime is 53121757517. The reversal of 53121757500 is 575712135.

It is a happy number.

53121757500 is a `hidden beast` number, since 531 + 2 + 1 + 75 + 7 + 50 + 0 = 666.

It is a super-2 number, since 2×53121757500² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3299470 + ... + 3315530.

It is an arithmetic number, because the mean of its divisors is an integer number (556136042).

Almost surely, 2^53121757500 is an apocalyptic number.

53121757500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53121757500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100104487560).

53121757500 is an abundant number, since it is smaller than the sum of its proper divisors (147087217620).

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

53121757500 is a wasteful number, since it uses less digits than its factorization.

53121757500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16108 (or 16078 counting only the distinct ones).

The product of its (nonzero) digits is 36750, while the sum is 36.

The spelling of 53121757500 in words is "fifty-three billion, one hundred twenty-one million, seven hundred fifty-seven thousand, five hundred".