51128521770 has 128 divisors (see below), whose sum is σ = 134667878400. Its totient is φ = 12377933568.

The previous prime is 51128521753. The next prime is 51128521781. The reversal of 51128521770 is 7712582115.

It is a super-2 number, since 2×51128521770² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1279351 + ... + 1318709.

It is an arithmetic number, because the mean of its divisors is an integer number (1052092800).

Almost surely, 2^51128521770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51128521770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67333939200).

51128521770 is an abundant number, since it is smaller than the sum of its proper divisors (83539356630).

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

51128521770 is a wasteful number, since it uses less digits than its factorization.

51128521770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39484.

The product of its (nonzero) digits is 39200, while the sum is 39.

The spelling of 51128521770 in words is "fifty-one billion, one hundred twenty-eight million, five hundred twenty-one thousand, seven hundred seventy".