51504210520 has 128 divisors (see below), whose sum is σ = 136622684160. Its totient is φ = 17109480960.

The previous prime is 51504210517. The next prime is 51504210529. The reversal of 51504210520 is 2501240515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504210529) 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, 1121857 + ... + 1166863.

It is an arithmetic number, because the mean of its divisors is an integer number (1067364720).

Almost surely, 2^51504210520 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 51504210520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68311342080).

51504210520 is an abundant number, since it is smaller than the sum of its proper divisors (85118473640).

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

51504210520 is a wasteful number, since it uses less digits than its factorization.

51504210520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45153 (or 45149 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 51504210520 in words is "fifty-one billion, five hundred four million, two hundred ten thousand, five hundred twenty".