51398217522137 has 2 divisors, whose sum is σ = 51398217522138. Its totient is φ = 51398217522136.

The previous prime is 51398217522103. The next prime is 51398217522313. The reversal of 51398217522137 is 73122571289315.

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., 51368698502416 + 29519019721 = 7167196^2 + 171811^2 .

It is a cyclic number.

It is not a de Polignac number, because 51398217522137 - 2¹⁰ = 51398217521113 is a prime.

It is not a weakly prime, because it can be changed into another prime (51398217522037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699108761068 + 25699108761069.

It is an arithmetic number, because the mean of its divisors is an integer number (25699108761069).

Almost surely, 2^{51398217522137} is an apocalyptic number.

It is an amenable number.

51398217522137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398217522137 is an equidigital number, since it uses as much as digits as its factorization.

51398217522137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 56.

The spelling of 51398217522137 in words is "fifty-one trillion, three hundred ninety-eight billion, two hundred seventeen million, five hundred twenty-two thousand, one hundred thirty-seven".