665664220133 has 8 divisors (see below), whose sum is σ = 726444114336. Its totient is φ = 604928486800.

The previous prime is 665664220121. The next prime is 665664220141. The reversal of 665664220133 is 331022466566.

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

It is not a de Polignac number, because 665664220133 - 2⁸ = 665664219877 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 (665664220103) 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, 11008691 + ... + 11068992.

It is an arithmetic number, because the mean of its divisors is an integer number (90805514292).

Almost surely, 2^665664220133 is an apocalyptic number.

It is an amenable number.

665664220133 is a deficient number, since it is larger than the sum of its proper divisors (60779894203).

665664220133 is a wasteful number, since it uses less digits than its factorization.

665664220133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22080435.

The product of its (nonzero) digits is 933120, while the sum is 44.

Adding to 665664220133 its reverse (331022466566), we get a palindrome (996686686699).

The spelling of 665664220133 in words is "six hundred sixty-five billion, six hundred sixty-four million, two hundred twenty thousand, one hundred thirty-three".