65664659 has 8 divisors (see below), whose sum is σ = 69653808. Its totient is φ = 61689600.

The previous prime is 65664649. The next prime is 65664661. The reversal of 65664659 is 95646656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-65664659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65664619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7004 + ... + 13430.

It is an arithmetic number, because the mean of its divisors is an integer number (8706726).

Almost surely, 2^65664659 is an apocalyptic number.

65664659 is a deficient number, since it is larger than the sum of its proper divisors (3989149).

65664659 is a wasteful number, since it uses less digits than its factorization.

65664659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7045.

The product of its digits is 1166400, while the sum is 47.

The square root of 65664659 is about 8103.3733099247. The cubic root of 65664659 is about 403.4383984348.

It can be divided in two parts, 6 and 5664659, that added together give a palindrome (5664665).

The spelling of 65664659 in words is "sixty-five million, six hundred sixty-four thousand, six hundred fifty-nine".