65664533 has 8 divisors (see below), whose sum is σ = 71936640. Its totient is φ = 59442880.

The previous prime is 65664491. The next prime is 65664553. The reversal of 65664533 is 33546656.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 65664533 - 2²² = 61470229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9860 + ... + 15117.

It is an arithmetic number, because the mean of its divisors is an integer number (8992080).

Almost surely, 2^65664533 is an apocalyptic number.

It is an amenable number.

65664533 is a deficient number, since it is larger than the sum of its proper divisors (6272107).

65664533 is a wasteful number, since it uses less digits than its factorization.

65664533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25227.

The product of its digits is 194400, while the sum is 38.

The square root of 65664533 is about 8103.3655353810. The cubic root of 65664533 is about 403.4381403900.

The spelling of 65664533 in words is "sixty-five million, six hundred sixty-four thousand, five hundred thirty-three".