51259998161 has 2 divisors, whose sum is σ = 51259998162. Its totient is φ = 51259998160.

The previous prime is 51259998143. The next prime is 51259998169. The reversal of 51259998161 is 16189995215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51112618561 + 147379600 = 226081^2 + 12140^2 .

It is a cyclic number.

It is not a de Polignac number, because 51259998161 - 2²² = 51255803857 is a prime.

It is a super-2 number, since 2×51259998161² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51259998097 and 51259998106.

It is not a weakly prime, because it can be changed into another prime (51259998169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25629999080 + 25629999081.

It is an arithmetic number, because the mean of its divisors is an integer number (25629999081).

Almost surely, 2^51259998161 is an apocalyptic number.

It is an amenable number.

51259998161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51259998161 is an equidigital number, since it uses as much as digits as its factorization.

51259998161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 56.

The spelling of 51259998161 in words is "fifty-one billion, two hundred fifty-nine million, nine hundred ninety-eight thousand, one hundred sixty-one".