51520467137 has 2 divisors, whose sum is σ = 51520467138. Its totient is φ = 51520467136.

The previous prime is 51520467101. The next prime is 51520467217. The reversal of 51520467137 is 73176402515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50968029121 + 552438016 = 225761^2 + 23504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520467137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51520467094 and 51520467103.

It is not a weakly prime, because it can be changed into another prime (51520497137) 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, 25760233568 + 25760233569.

It is an arithmetic number, because the mean of its divisors is an integer number (25760233569).

Almost surely, 2^51520467137 is an apocalyptic number.

It is an amenable number.

51520467137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520467137 is an equidigital number, since it uses as much as digits as its factorization.

51520467137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 51520467137 in words is "fifty-one billion, five hundred twenty million, four hundred sixty-seven thousand, one hundred thirty-seven".