51551000161 has 2 divisors, whose sum is σ = 51551000162. Its totient is φ = 51551000160.

The previous prime is 51551000131. The next prime is 51551000191. The reversal of 51551000161 is 16100015515.

It is a balanced prime because it is at equal distance from previous prime (51551000131) and next prime (51551000191).

It can be written as a sum of positive squares in only one way, i.e., 51411027600 + 139972561 = 226740^2 + 11831^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551000161 - 2⁵ = 51551000129 is a prime.

It is not a weakly prime, because it can be changed into another prime (51551000131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775500080 + 25775500081.

It is an arithmetic number, because the mean of its divisors is an integer number (25775500081).

Almost surely, 2^51551000161 is an apocalyptic number.

It is an amenable number.

51551000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551000161 is an equidigital number, since it uses as much as digits as its factorization.

51551000161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 25.

Adding to 51551000161 its reverse (16100015515), we get a palindrome (67651015676).

The spelling of 51551000161 in words is "fifty-one billion, five hundred fifty-one million, one hundred sixty-one", and thus it is an aban number.