51520875508 has 6 divisors (see below), whose sum is σ = 90161532146. Its totient is φ = 25760437752.

The previous prime is 51520875491. The next prime is 51520875509. The reversal of 51520875508 is 80557802515.

It can be written as a sum of positive squares in only one way, i.e., 50051533284 + 1469342224 = 223722^2 + 38332^2 .

It is a super-2 number, since 2×51520875508² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520875509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6440109435 + ... + 6440109442.

Almost surely, 2^51520875508 is an apocalyptic number.

It is an amenable number.

51520875508 is a deficient number, since it is larger than the sum of its proper divisors (38640656638).

51520875508 is a wasteful number, since it uses less digits than its factorization.

51520875508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12880218881 (or 12880218879 counting only the distinct ones).

The product of its (nonzero) digits is 560000, while the sum is 46.

The spelling of 51520875508 in words is "fifty-one billion, five hundred twenty million, eight hundred seventy-five thousand, five hundred eight".