65171551 has 2 divisors, whose sum is σ = 65171552. Its totient is φ = 65171550.

The previous prime is 65171549. The next prime is 65171569. The reversal of 65171551 is 15517156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65171551 - 2¹ = 65171549 is a prime.

Together with 65171549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65171521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32585775 + 32585776.

It is an arithmetic number, because the mean of its divisors is an integer number (32585776).

Almost surely, 2^65171551 is an apocalyptic number.

65171551 is a deficient number, since it is larger than the sum of its proper divisors (1).

65171551 is an equidigital number, since it uses as much as digits as its factorization.

65171551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5250, while the sum is 31.

The square root of 65171551 is about 8072.8898790953. The cubic root of 65171551 is about 402.4259879603.

It can be divided in two parts, 6517155 and 1, that added together give a palindrome (6517156).

The spelling of 65171551 in words is "sixty-five million, one hundred seventy-one thousand, five hundred fifty-one".