3945649228369 has 2 divisors, whose sum is σ = 3945649228370. Its totient is φ = 3945649228368.

The previous prime is 3945649228351. The next prime is 3945649228379. The reversal of 3945649228369 is 9638229465493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2317503852225 + 1628145376144 = 1522335^2 + 1275988^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945649228369 - 2⁵ = 3945649228337 is a prime.

It is a super-2 number, since 2×3945649228369² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3945649228298 and 3945649228307.

It is not a weakly prime, because it can be changed into another prime (3945649228349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972824614184 + 1972824614185.

It is an arithmetic number, because the mean of its divisors is an integer number (1972824614185).

Almost surely, 2^{3945649228369} is an apocalyptic number.

It is an amenable number.

3945649228369 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945649228369 is an equidigital number, since it uses as much as digits as its factorization.

3945649228369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604661760, while the sum is 70.

The spelling of 3945649228369 in words is "three trillion, nine hundred forty-five billion, six hundred forty-nine million, two hundred twenty-eight thousand, three hundred sixty-nine".