65641897 has 2 divisors, whose sum is σ = 65641898. Its totient is φ = 65641896.

The previous prime is 65641867. The next prime is 65641957. The reversal of 65641897 is 79814656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63297936 + 2343961 = 7956^2 + 1531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65641897 is a prime.

It is not a weakly prime, because it can be changed into another prime (65641847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820948 + 32820949.

It is an arithmetic number, because the mean of its divisors is an integer number (32820949).

Almost surely, 2^65641897 is an apocalyptic number.

It is an amenable number.

65641897 is a deficient number, since it is larger than the sum of its proper divisors (1).

65641897 is an equidigital number, since it uses as much as digits as its factorization.

65641897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 65641897 is about 8101.9687113689. The cubic root of 65641897 is about 403.3917770799.

The spelling of 65641897 in words is "sixty-five million, six hundred forty-one thousand, eight hundred ninety-seven".