51265447728 has 80 divisors (see below), whose sum is σ = 144505036800. Its totient is φ = 15531792640.

The previous prime is 51265447699. The next prime is 51265447811. The reversal of 51265447728 is 82774456215.

It is a super-2 number, since 2×51265447728² (a number of 22 digits) contains 22 as substring.

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, 4444753 + ... + 4456271.

It is an arithmetic number, because the mean of its divisors is an integer number (1806312960).

Almost surely, 2^51265447728 is an apocalyptic number.

It is an amenable number.

51265447728 is an abundant number, since it is smaller than the sum of its proper divisors (93239589072).

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

51265447728 is a wasteful number, since it uses less digits than its factorization.

51265447728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19970 (or 19964 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 51.

The spelling of 51265447728 in words is "fifty-one billion, two hundred sixty-five million, four hundred forty-seven thousand, seven hundred twenty-eight".