51520475328 has 168 divisors, whose sum is σ = 160744369392. Its totient is φ = 14518296576.

The previous prime is 51520475317. The next prime is 51520475329. The reversal of 51520475328 is 82357402515.

51520475328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 51520475328.

It is not an unprimeable number, because it can be changed into a prime (51520475329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649276 + ... + 724292.

Almost surely, 2^51520475328 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 51520475328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80372184696).

51520475328 is an abundant number, since it is smaller than the sum of its proper divisors (109223894064).

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

51520475328 is a wasteful number, since it uses less digits than its factorization.

51520475328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75119 (or 75102 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 51520475328 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, three hundred twenty-eight".