51161242063 has 2 divisors, whose sum is σ = 51161242064. Its totient is φ = 51161242062.

The previous prime is 51161242039. The next prime is 51161242091. The reversal of 51161242063 is 36024216115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51161242063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51161242763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25580621031 + 25580621032.

It is an arithmetic number, because the mean of its divisors is an integer number (25580621032).

Almost surely, 2^51161242063 is an apocalyptic number.

51161242063 is a deficient number, since it is larger than the sum of its proper divisors (1).

51161242063 is an equidigital number, since it uses as much as digits as its factorization.

51161242063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 51161242063 its reverse (36024216115), we get a palindrome (87185458178).

The spelling of 51161242063 in words is "fifty-one billion, one hundred sixty-one million, two hundred forty-two thousand, sixty-three".