165561150411947 has 2 divisors, whose sum is σ = 165561150411948. Its totient is φ = 165561150411946.

The previous prime is 165561150411941. The next prime is 165561150411959. The reversal of 165561150411947 is 749114051165561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165561150411947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165561150411892 and 165561150411901.

It is not a weakly prime, because it can be changed into another prime (165561150411941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780575205973 + 82780575205974.

It is an arithmetic number, because the mean of its divisors is an integer number (82780575205974).

Almost surely, 2^{165561150411947} is an apocalyptic number.

165561150411947 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561150411947 is an equidigital number, since it uses as much as digits as its factorization.

165561150411947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 56.

The spelling of 165561150411947 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty million, four hundred eleven thousand, nine hundred forty-seven".