65605651 has 4 divisors (see below), whose sum is σ = 69058600. Its totient is φ = 62152704.

The previous prime is 65605621. The next prime is 65605667. The reversal of 65605651 is 15650656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65605651 - 2⁵ = 65605619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65605621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1726446 + ... + 1726483.

It is an arithmetic number, because the mean of its divisors is an integer number (17264650).

Almost surely, 2^65605651 is an apocalyptic number.

65605651 is a deficient number, since it is larger than the sum of its proper divisors (3452949).

65605651 is a wasteful number, since it uses less digits than its factorization.

65605651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452948.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65605651 is about 8099.7315387610. The cubic root of 65605651 is about 403.3175154115.

The spelling of 65605651 in words is "sixty-five million, six hundred five thousand, six hundred fifty-one".