65921533 has 4 divisors (see below), whose sum is σ = 65944060. Its totient is φ = 65899008.

The previous prime is 65921497. The next prime is 65921539. The reversal of 65921533 is 33512956.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34539129 + 31382404 = 5877^2 + 5602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65921533 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 (65921539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6078 + ... + 12991.

It is an arithmetic number, because the mean of its divisors is an integer number (16486015).

Almost surely, 2^65921533 is an apocalyptic number.

It is an amenable number.

65921533 is a deficient number, since it is larger than the sum of its proper divisors (22527).

65921533 is a wasteful number, since it uses less digits than its factorization.

65921533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22526.

The product of its digits is 24300, while the sum is 34.

The square root of 65921533 is about 8119.2076583864. The cubic root of 65921533 is about 403.9637850261.

The spelling of 65921533 in words is "sixty-five million, nine hundred twenty-one thousand, five hundred thirty-three".