165081906973 has 2 divisors, whose sum is σ = 165081906974. Its totient is φ = 165081906972.

The previous prime is 165081906967. The next prime is 165081907019. The reversal of 165081906973 is 379609180561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103360964004 + 61720942969 = 321498^2 + 248437^2 .

It is a cyclic number.

It is not a de Polignac number, because 165081906973 - 2²¹ = 165079809821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165081906173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82540953486 + 82540953487.

It is an arithmetic number, because the mean of its divisors is an integer number (82540953487).

Almost surely, 2^165081906973 is an apocalyptic number.

It is an amenable number.

165081906973 is a deficient number, since it is larger than the sum of its proper divisors (1).

165081906973 is an equidigital number, since it uses as much as digits as its factorization.

165081906973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 165081906973 in words is "one hundred sixty-five billion, eighty-one million, nine hundred six thousand, nine hundred seventy-three".