165321561672117 has 16 divisors (see below), whose sum is σ = 244923210026880. Its totient is φ = 110213304384096.

The previous prime is 165321561672103. The next prime is 165321561672133. The reversal of 165321561672117 is 711276165123561.

165321561672117 is a `hidden beast` number, since 1 + 6 + 5 + 3 + 2 + 1 + 5 + 616 + 7 + 2 + 1 + 17 = 666.

It is not a de Polignac number, because 165321561672117 - 2¹⁰ = 165321561671093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165321561672517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26886633 + ... + 32458190.

It is an arithmetic number, because the mean of its divisors is an integer number (15307700626680).

Almost surely, 2^{165321561672117} is an apocalyptic number.

It is an amenable number.

165321561672117 is a deficient number, since it is larger than the sum of its proper divisors (79601648354763).

165321561672117 is a wasteful number, since it uses less digits than its factorization.

165321561672117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59448009 (or 59448003 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The spelling of 165321561672117 in words is "one hundred sixty-five trillion, three hundred twenty-one billion, five hundred sixty-one million, six hundred seventy-two thousand, one hundred seventeen".