165535654464497 has 2 divisors, whose sum is σ = 165535654464498. Its totient is φ = 165535654464496.

The previous prime is 165535654464491. The next prime is 165535654464511. The reversal of 165535654464497 is 794464456535561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125739352782736 + 39796301681761 = 11213356^2 + 6308431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165535654464497 is a prime.

It is not a weakly prime, because it can be changed into another prime (165535654464491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82767827232248 + 82767827232249.

It is an arithmetic number, because the mean of its divisors is an integer number (82767827232249).

Almost surely, 2^{165535654464497} is an apocalyptic number.

It is an amenable number.

165535654464497 is a deficient number, since it is larger than the sum of its proper divisors (1).

165535654464497 is an equidigital number, since it uses as much as digits as its factorization.

165535654464497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840000, while the sum is 74.

The spelling of 165535654464497 in words is "one hundred sixty-five trillion, five hundred thirty-five billion, six hundred fifty-four million, four hundred sixty-four thousand, four hundred ninety-seven".