51512351540 has 48 divisors (see below), whose sum is σ = 116720220288. Its totient is φ = 18983528064.

The previous prime is 51512351531. The next prime is 51512351549. The reversal of 51512351540 is 4515321515.

It is an interprime number because it is at equal distance from previous prime (51512351531) and next prime (51512351549).

It is a super-2 number, since 2×51512351540² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51512351497 and 51512351506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51512351549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53432 + ... + 325391.

It is an arithmetic number, because the mean of its divisors is an integer number (2431671256).

Almost surely, 2^51512351540 is an apocalyptic number.

It is an amenable number.

51512351540 is an abundant number, since it is smaller than the sum of its proper divisors (65207868748).

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

51512351540 is a wasteful number, since it uses less digits than its factorization.

51512351540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379368 (or 379366 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 51512351540 in words is "fifty-one billion, five hundred twelve million, three hundred fifty-one thousand, five hundred forty".