16665444361 has 2 divisors, whose sum is σ = 16665444362. Its totient is φ = 16665444360.

The previous prime is 16665444353. The next prime is 16665444371. The reversal of 16665444361 is 16344456661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8754409225 + 7911035136 = 93565^2 + 88944^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665444361 - 2³ = 16665444353 is a prime.

It is a super-3 number, since 3×16665444361³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16665444371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332722180 + 8332722181.

It is an arithmetic number, because the mean of its divisors is an integer number (8332722181).

Almost surely, 2^16665444361 is an apocalyptic number.

It is an amenable number.

16665444361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16665444361 is an equidigital number, since it uses as much as digits as its factorization.

16665444361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 46.

The spelling of 16665444361 in words is "sixteen billion, six hundred sixty-five million, four hundred forty-four thousand, three hundred sixty-one".