65161081 has 2 divisors, whose sum is σ = 65161082. Its totient is φ = 65161080.

The previous prime is 65161079. The next prime is 65161121. The reversal of 65161081 is 18016156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56866681 + 8294400 = 7541^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 65161081 - 2¹ = 65161079 is a prime.

It is a super-2 number, since 2×65161081² = 8491932954177122, which contains 22 as substring.

Together with 65161079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65101081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32580540 + 32580541.

It is an arithmetic number, because the mean of its divisors is an integer number (32580541).

Almost surely, 2^65161081 is an apocalyptic number.

It is an amenable number.

65161081 is a deficient number, since it is larger than the sum of its proper divisors (1).

65161081 is an equidigital number, since it uses as much as digits as its factorization.

65161081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 65161081 is about 8072.2413863809. The cubic root of 65161081 is about 402.4044365028.

The spelling of 65161081 in words is "sixty-five million, one hundred sixty-one thousand, eighty-one".