51315125530 has 16 divisors (see below), whose sum is σ = 95346814464. Its totient is φ = 19863919440.

The previous prime is 51315125509. The next prime is 51315125557. The reversal of 51315125530 is 3552151315.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 51315125492 and 51315125501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82766022 + ... + 82766641.

It is an arithmetic number, because the mean of its divisors is an integer number (5959175904).

Almost surely, 2^51315125530 is an apocalyptic number.

51315125530 is a deficient number, since it is larger than the sum of its proper divisors (44031688934).

51315125530 is a wasteful number, since it uses less digits than its factorization.

51315125530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165532701.

The product of its (nonzero) digits is 11250, while the sum is 31.

Adding to 51315125530 its reverse (3552151315), we get a palindrome (54867276845).

The spelling of 51315125530 in words is "fifty-one billion, three hundred fifteen million, one hundred twenty-five thousand, five hundred thirty".