133213566165 has 16 divisors (see below), whose sum is σ = 217676636928. Its totient is φ = 69535591616.

The previous prime is 133213566139. The next prime is 133213566179. The reversal of 133213566165 is 561665312331.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 133213566165 - 2²⁰ = 133212517589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94477002 + ... + 94478411.

It is an arithmetic number, because the mean of its divisors is an integer number (13604789808).

Almost surely, 2^133213566165 is an apocalyptic number.

133213566165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133213566165 is a deficient number, since it is larger than the sum of its proper divisors (84463070763).

133213566165 is a wasteful number, since it uses less digits than its factorization.

133213566165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188955468.

The product of its digits is 291600, while the sum is 42.

Adding to 133213566165 its reverse (561665312331), we get a palindrome (694878878496).

The spelling of 133213566165 in words is "one hundred thirty-three billion, two hundred thirteen million, five hundred sixty-six thousand, one hundred sixty-five".