6665221533 has 8 divisors (see below), whose sum is σ = 8925104448. Its totient is φ = 4424409824.

The previous prime is 6665221517. The next prime is 6665221571. The reversal of 6665221533 is 3351225666.

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 6665221533 - 2⁴ = 6665221517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6665221491 and 6665221500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665221513) 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, 4766985 + ... + 4768382.

It is an arithmetic number, because the mean of its divisors is an integer number (1115638056).

Almost surely, 2^6665221533 is an apocalyptic number.

It is an amenable number.

6665221533 is a deficient number, since it is larger than the sum of its proper divisors (2259882915).

6665221533 is a wasteful number, since it uses less digits than its factorization.

6665221533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9535603.

The product of its digits is 194400, while the sum is 39.

The square root of 6665221533 is about 81640.8080129049. The cubic root of 6665221533 is about 1881.9360556498.

The spelling of 6665221533 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, five hundred thirty-three".