165561150011947 has 2 divisors, whose sum is σ = 165561150011948. Its totient is φ = 165561150011946.

The previous prime is 165561150011897. The next prime is 165561150011969. The reversal of 165561150011947 is 749110051165561.

It is a strong prime.

It is an emirp because it is prime and its reverse (749110051165561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165561150011947 - 2¹⁵ = 165561149979179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165561150011894 and 165561150011903.

It is not a weakly prime, because it can be changed into another prime (165561150411947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780575005973 + 82780575005974.

It is an arithmetic number, because the mean of its divisors is an integer number (82780575005974).

Almost surely, 2^{165561150011947} is an apocalyptic number.

165561150011947 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561150011947 is an equidigital number, since it uses as much as digits as its factorization.

165561150011947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134000, while the sum is 52.

The spelling of 165561150011947 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty million, eleven thousand, nine hundred forty-seven".