65641957 has 2 divisors, whose sum is σ = 65641958. Its totient is φ = 65641956.

The previous prime is 65641897. The next prime is 65641991. The reversal of 65641957 is 75914656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57062916 + 8579041 = 7554^2 + 2929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65641957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65641997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820978 + 32820979.

It is an arithmetic number, because the mean of its divisors is an integer number (32820979).

Almost surely, 2^65641957 is an apocalyptic number.

It is an amenable number.

65641957 is a deficient number, since it is larger than the sum of its proper divisors (1).

65641957 is an equidigital number, since it uses as much as digits as its factorization.

65641957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 65641957 is about 8101.9724141717. The cubic root of 65641957 is about 403.3918999867.

The spelling of 65641957 in words is "sixty-five million, six hundred forty-one thousand, nine hundred fifty-seven".