65646641 has 4 divisors (see below), whose sum is σ = 65896512. Its totient is φ = 65396772.

The previous prime is 65646631. The next prime is 65646643. The reversal of 65646641 is 14664656.

65646641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65646641 - 2¹⁰ = 65645617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65646595 and 65646604.

It is not an unprimeable number, because it can be changed into a prime (65646643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 124541 + ... + 125066.

It is an arithmetic number, because the mean of its divisors is an integer number (16474128).

Almost surely, 2^65646641 is an apocalyptic number.

It is an amenable number.

65646641 is a deficient number, since it is larger than the sum of its proper divisors (249871).

65646641 is a wasteful number, since it uses less digits than its factorization.

65646641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249870.

The product of its digits is 103680, while the sum is 38.

The square root of 65646641 is about 8102.2614744280. The cubic root of 65646641 is about 403.4014946769.

The spelling of 65646641 in words is "sixty-five million, six hundred forty-six thousand, six hundred forty-one".