165036364981 has 2 divisors, whose sum is σ = 165036364982. Its totient is φ = 165036364980.

The previous prime is 165036364963. The next prime is 165036365027. The reversal of 165036364981 is 189463630561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154638484081 + 10397880900 = 393241^2 + 101970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165036364981 is a prime.

It is a super-2 number, since 2×165036364981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165036364481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82518182490 + 82518182491.

It is an arithmetic number, because the mean of its divisors is an integer number (82518182491).

Almost surely, 2^165036364981 is an apocalyptic number.

It is an amenable number.

165036364981 is a deficient number, since it is larger than the sum of its proper divisors (1).

165036364981 is an equidigital number, since it uses as much as digits as its factorization.

165036364981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 165036364981 in words is "one hundred sixty-five billion, thirty-six million, three hundred sixty-four thousand, nine hundred eighty-one".