51521550000 has 240 divisors, whose sum is σ = 168123551904. Its totient is φ = 13593600000.

The previous prime is 51521549971. The next prime is 51521550019. The reversal of 51521550000 is 5512515.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×51521550000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14548230 + ... + 14551770.

Almost surely, 2^51521550000 is an apocalyptic number.

51521550000 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 51521550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84061775952).

51521550000 is an abundant number, since it is smaller than the sum of its proper divisors (116602001904).

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

51521550000 is an equidigital number, since it uses as much as digits as its factorization.

51521550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674 (or 3648 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The spelling of 51521550000 in words is "fifty-one billion, five hundred twenty-one million, five hundred fifty thousand".