65128061 has 2 divisors, whose sum is σ = 65128062. Its totient is φ = 65128060.

The previous prime is 65128057. The next prime is 65128073. The reversal of 65128061 is 16082156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44023225 + 21104836 = 6635^2 + 4594^2 .

It is a cyclic number.

It is not a de Polignac number, because 65128061 - 2² = 65128057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65128051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32564030 + 32564031.

It is an arithmetic number, because the mean of its divisors is an integer number (32564031).

Almost surely, 2^65128061 is an apocalyptic number.

It is an amenable number.

65128061 is a deficient number, since it is larger than the sum of its proper divisors (1).

65128061 is an equidigital number, since it uses as much as digits as its factorization.

65128061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 65128061 is about 8070.1958464464. The cubic root of 65128061 is about 402.3364529797.

The spelling of 65128061 in words is "sixty-five million, one hundred twenty-eight thousand, sixty-one".