51504215137 has 2 divisors, whose sum is σ = 51504215138. Its totient is φ = 51504215136.

The previous prime is 51504215101. The next prime is 51504215159. The reversal of 51504215137 is 73151240515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36221321761 + 15282893376 = 190319^2 + 123624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51504215137 is a prime.

It is not a weakly prime, because it can be changed into another prime (51504215237) 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, 25752107568 + 25752107569.

It is an arithmetic number, because the mean of its divisors is an integer number (25752107569).

Almost surely, 2^51504215137 is an apocalyptic number.

It is an amenable number.

51504215137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51504215137 is an equidigital number, since it uses as much as digits as its factorization.

51504215137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 51504215137 in words is "fifty-one billion, five hundred four million, two hundred fifteen thousand, one hundred thirty-seven".