161266717 has 2 divisors, whose sum is σ = 161266718. Its totient is φ = 161266716.

The previous prime is 161266711. The next prime is 161266733. The reversal of 161266717 is 717662161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161264601 + 2116 = 12699^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 161266717 - 2¹⁵ = 161233949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161266711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80633358 + 80633359.

It is an arithmetic number, because the mean of its divisors is an integer number (80633359).

Almost surely, 2^161266717 is an apocalyptic number.

It is an amenable number.

161266717 is a deficient number, since it is larger than the sum of its proper divisors (1).

161266717 is an equidigital number, since it uses as much as digits as its factorization.

161266717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 161266717 is about 12699.0833133734. The cubic root of 161266717 is about 544.3124252887.

The spelling of 161266717 in words is "one hundred sixty-one million, two hundred sixty-six thousand, seven hundred seventeen".