165609154873 has 2 divisors, whose sum is σ = 165609154874. Its totient is φ = 165609154872.

The previous prime is 165609154859. The next prime is 165609154889. The reversal of 165609154873 is 378451906561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109956570409 + 55652584464 = 331597^2 + 235908^2 .

It is an emirp because it is prime and its reverse (378451906561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165609154873 is a prime.

It is a super-2 number, since 2×165609154873² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165609104873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82804577436 + 82804577437.

It is an arithmetic number, because the mean of its divisors is an integer number (82804577437).

Almost surely, 2^165609154873 is an apocalyptic number.

It is an amenable number.

165609154873 is a deficient number, since it is larger than the sum of its proper divisors (1).

165609154873 is an equidigital number, since it uses as much as digits as its factorization.

165609154873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 165609154873 in words is "one hundred sixty-five billion, six hundred nine million, one hundred fifty-four thousand, eight hundred seventy-three".