3909961916173 has 2 divisors, whose sum is σ = 3909961916174. Its totient is φ = 3909961916172.

The previous prime is 3909961916143. The next prime is 3909961916249. The reversal of 3909961916173 is 3716191699093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3274373487529 + 635588428644 = 1809523^2 + 797238^2 .

It is a cyclic number.

It is not a de Polignac number, because 3909961916173 - 2²⁵ = 3909928361741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3909961916143) 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, 1954980958086 + 1954980958087.

It is an arithmetic number, because the mean of its divisors is an integer number (1954980958087).

Almost surely, 2^{3909961916173} is an apocalyptic number.

It is an amenable number.

3909961916173 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909961916173 is an equidigital number, since it uses as much as digits as its factorization.

3909961916173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14880348, while the sum is 64.

The spelling of 3909961916173 in words is "three trillion, nine hundred nine billion, nine hundred sixty-one million, nine hundred sixteen thousand, one hundred seventy-three".