165609972503387 has 2 divisors, whose sum is σ = 165609972503388. Its totient is φ = 165609972503386.

The previous prime is 165609972503363. The next prime is 165609972503447. The reversal of 165609972503387 is 783305279906561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165609972503387 - 2¹⁸ = 165609972241243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165609972503387.

It is not a weakly prime, because it can be changed into another prime (165609972500387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82804986251693 + 82804986251694.

It is an arithmetic number, because the mean of its divisors is an integer number (82804986251694).

Almost surely, 2^{165609972503387} is an apocalyptic number.

165609972503387 is a deficient number, since it is larger than the sum of its proper divisors (1).

165609972503387 is an equidigital number, since it uses as much as digits as its factorization.

165609972503387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 514382400, while the sum is 71.

The spelling of 165609972503387 in words is "one hundred sixty-five trillion, six hundred nine billion, nine hundred seventy-two million, five hundred three thousand, three hundred eighty-seven".