165535654464491 has 2 divisors, whose sum is σ = 165535654464492. Its totient is φ = 165535654464490.

The previous prime is 165535654464463. The next prime is 165535654464497. The reversal of 165535654464491 is 194464456535561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165535654464491 is a prime.

It is not a weakly prime, because it can be changed into another prime (165535654464497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82767827232245 + 82767827232246.

It is an arithmetic number, because the mean of its divisors is an integer number (82767827232246).

Almost surely, 2^{165535654464491} is an apocalyptic number.

165535654464491 is a deficient number, since it is larger than the sum of its proper divisors (1).

165535654464491 is an equidigital number, since it uses as much as digits as its factorization.

165535654464491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120000, while the sum is 68.

The spelling of 165535654464491 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-one".