165611043863 has 2 divisors, whose sum is σ = 165611043864. Its totient is φ = 165611043862.

The previous prime is 165611043811. The next prime is 165611043877. The reversal of 165611043863 is 368340116561.

It is a strong prime.

It is an emirp because it is prime and its reverse (368340116561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165611043863 - 2¹² = 165611039767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165611046863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82805521931 + 82805521932.

It is an arithmetic number, because the mean of its divisors is an integer number (82805521932).

Almost surely, 2^165611043863 is an apocalyptic number.

165611043863 is a deficient number, since it is larger than the sum of its proper divisors (1).

165611043863 is an equidigital number, since it uses as much as digits as its factorization.

165611043863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 165611043863 in words is "one hundred sixty-five billion, six hundred eleven million, forty-three thousand, eight hundred sixty-three".