51675987161 has 2 divisors, whose sum is σ = 51675987162. Its totient is φ = 51675987160.

The previous prime is 51675987113. The next prime is 51675987163. The reversal of 51675987161 is 16178957615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45268945225 + 6407041936 = 212765^2 + 80044^2 .

It is a cyclic number.

It is not a de Polignac number, because 51675987161 - 2¹⁰ = 51675986137 is a prime.

Together with 51675987163, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51675987097 and 51675987106.

It is not a weakly prime, because it can be changed into another prime (51675987163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25837993580 + 25837993581.

It is an arithmetic number, because the mean of its divisors is an integer number (25837993581).

Almost surely, 2^51675987161 is an apocalyptic number.

It is an amenable number.

51675987161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51675987161 is an equidigital number, since it uses as much as digits as its factorization.

51675987161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 56.

The spelling of 51675987161 in words is "fifty-one billion, six hundred seventy-five million, nine hundred eighty-seven thousand, one hundred sixty-one".