51315145320 has 64 divisors (see below), whose sum is σ = 163001056320. Its totient is φ = 12879094784.

The previous prime is 51315145309. The next prime is 51315145333. The reversal of 51315145320 is 2354151315.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 12575202 + ... + 12579281.

It is an arithmetic number, because the mean of its divisors is an integer number (2546891505).

Almost surely, 2^51315145320 is an apocalyptic number.

It is an amenable number.

51315145320 is an abundant number, since it is smaller than the sum of its proper divisors (111685911000).

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

51315145320 is a wasteful number, since it uses less digits than its factorization.

51315145320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25154514 (or 25154510 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 51315145320 its reverse (2354151315), we get a palindrome (53669296635).

The spelling of 51315145320 in words is "fifty-one billion, three hundred fifteen million, one hundred forty-five thousand, three hundred twenty".