51504505520 has 80 divisors (see below), whose sum is σ = 129082779840. Its totient is φ = 18998848512.

The previous prime is 51504505517. The next prime is 51504505543. The reversal of 51504505520 is 2550540515.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1088597 + ... + 1134923.

It is an arithmetic number, because the mean of its divisors is an integer number (1613534748).

Almost surely, 2^51504505520 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 51504505520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64541389920).

51504505520 is an abundant number, since it is smaller than the sum of its proper divisors (77578274320).

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

51504505520 is a wasteful number, since it uses less digits than its factorization.

51504505520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47422 (or 47416 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 32.

The spelling of 51504505520 in words is "fifty-one billion, five hundred four million, five hundred five thousand, five hundred twenty".