165663123544231 has 2 divisors, whose sum is σ = 165663123544232. Its totient is φ = 165663123544230.

The previous prime is 165663123544213. The next prime is 165663123544333. The reversal of 165663123544231 is 132445321366561.

Together with previous prime (165663123544213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165663123544231 - 2⁹ = 165663123543719 is a prime.

It is a super-2 number, since 2×165663123544231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165663123544211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82831561772115 + 82831561772116.

It is an arithmetic number, because the mean of its divisors is an integer number (82831561772116).

Almost surely, 2^{165663123544231} is an apocalyptic number.

165663123544231 is a deficient number, since it is larger than the sum of its proper divisors (1).

165663123544231 is an equidigital number, since it uses as much as digits as its factorization.

165663123544231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 52.

The spelling of 165663123544231 in words is "one hundred sixty-five trillion, six hundred sixty-three billion, one hundred twenty-three million, five hundred forty-four thousand, two hundred thirty-one".