65641867 has 2 divisors, whose sum is σ = 65641868. Its totient is φ = 65641866.

The previous prime is 65641847. The next prime is 65641897. The reversal of 65641867 is 76814656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65641867 is a prime.

It is a super-3 number, since 3×65641867³ (a number of 24 digits) contains 333 as substring.

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, 32820933 + 32820934.

It is an arithmetic number, because the mean of its divisors is an integer number (32820934).

Almost surely, 2^65641867 is an apocalyptic number.

65641867 is a deficient number, since it is larger than the sum of its proper divisors (1).

65641867 is an equidigital number, since it uses as much as digits as its factorization.

65641867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 65641867 is about 8101.9668599668. The cubic root of 65641867 is about 403.3917156265.

The spelling of 65641867 in words is "sixty-five million, six hundred forty-one thousand, eight hundred sixty-seven".