51635522137 has 2 divisors, whose sum is σ = 51635522138. Its totient is φ = 51635522136.

The previous prime is 51635522131. The next prime is 51635522149. The reversal of 51635522137 is 73122553615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44643886681 + 6991635456 = 211291^2 + 83616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51635522137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51635522137.

It is not a weakly prime, because it can be changed into another prime (51635522131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25817761068 + 25817761069.

It is an arithmetic number, because the mean of its divisors is an integer number (25817761069).

Almost surely, 2^51635522137 is an apocalyptic number.

It is an amenable number.

51635522137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51635522137 is an equidigital number, since it uses as much as digits as its factorization.

51635522137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 40.

The spelling of 51635522137 in words is "fifty-one billion, six hundred thirty-five million, five hundred twenty-two thousand, one hundred thirty-seven".