51616147181 has 2 divisors, whose sum is σ = 51616147182. Its totient is φ = 51616147180.

The previous prime is 51616147171. The next prime is 51616147189. The reversal of 51616147181 is 18174161615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49510255081 + 2105892100 = 222509^2 + 45890^2 .

It is a cyclic number.

It is not a de Polignac number, because 51616147181 - 2⁶ = 51616147117 is a prime.

It is a super-2 number, since 2×51616147181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51616147189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25808073590 + 25808073591.

It is an arithmetic number, because the mean of its divisors is an integer number (25808073591).

Almost surely, 2^51616147181 is an apocalyptic number.

It is an amenable number.

51616147181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51616147181 is an equidigital number, since it uses as much as digits as its factorization.

51616147181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 41.

The spelling of 51616147181 in words is "fifty-one billion, six hundred sixteen million, one hundred forty-seven thousand, one hundred eighty-one".