65641665 has 16 divisors (see below), whose sum is σ = 105336000. Its totient is φ = 34905792.

The previous prime is 65641661. The next prime is 65641721. The reversal of 65641665 is 56614656.

It is not a de Polignac number, because 65641665 - 2² = 65641661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65641661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (6583500).

Almost surely, 2^65641665 is an apocalyptic number.

It is an amenable number.

65641665 is a deficient number, since it is larger than the sum of its proper divisors (39694335).

65641665 is a wasteful number, since it uses less digits than its factorization.

65641665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12896.

The product of its digits is 129600, while the sum is 39.

The square root of 65641665 is about 8101.9543938484. The cubic root of 65641665 is about 403.3913018397.

The spelling of 65641665 in words is "sixty-five million, six hundred forty-one thousand, six hundred sixty-five".