165609972503447 has 2 divisors, whose sum is σ = 165609972503448. Its totient is φ = 165609972503446.

The previous prime is 165609972503387. The next prime is 165609972503501. The reversal of 165609972503447 is 744305279906561.

It is a strong prime.

It is an emirp because it is prime and its reverse (744305279906561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165609972503447 - 2¹⁸ = 165609972241303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165609972523447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82804986251723 + 82804986251724.

It is an arithmetic number, because the mean of its divisors is an integer number (82804986251724).

Almost surely, 2^{165609972503447} is an apocalyptic number.

165609972503447 is a deficient number, since it is larger than the sum of its proper divisors (1).

165609972503447 is an equidigital number, since it uses as much as digits as its factorization.

165609972503447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 342921600, while the sum is 68.

The spelling of 165609972503447 in words is "one hundred sixty-five trillion, six hundred nine billion, nine hundred seventy-two million, five hundred three thousand, four hundred forty-seven".