65642668 has 24 divisors (see below), whose sum is σ = 141384992. Its totient is φ = 25968384.

The previous prime is 65642653. The next prime is 65642671. The reversal of 65642668 is 86624656.

65642668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89805 + ... + 90532.

Almost surely, 2^65642668 is an apocalyptic number.

It is an amenable number.

65642668 is an abundant number, since it is smaller than the sum of its proper divisors (75742324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65642668 is a wasteful number, since it uses less digits than its factorization.

65642668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180361 (or 180359 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The square root of 65642668 is about 8102.0162922571. The cubic root of 65642668 is about 403.3933564261.

The spelling of 65642668 in words is "sixty-five million, six hundred forty-two thousand, six hundred sixty-eight".