4447778869 has 2 divisors, whose sum is σ = 4447778870. Its totient is φ = 4447778868.

The previous prime is 4447778849. The next prime is 4447778873. The reversal of 4447778869 is 9688777444.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4259128644 + 188650225 = 65262^2 + 13735^2 .

It is a cyclic number.

It is not a de Polignac number, because 4447778869 - 2²⁷ = 4313561141 is a prime.

It is a super-2 number, since 2×4447778869² = 39565473735045838322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4447778869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4447778809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2223889434 + 2223889435.

It is an arithmetic number, because the mean of its divisors is an integer number (2223889435).

Almost surely, 2^4447778869 is an apocalyptic number.

It is an amenable number.

4447778869 is a deficient number, since it is larger than the sum of its proper divisors (1).

4447778869 is an equidigital number, since it uses as much as digits as its factorization.

4447778869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75866112, while the sum is 64.

The square root of 4447778869 is about 66691.6701620225. The cubic root of 4447778869 is about 1644.5524500087.

The spelling of 4447778869 in words is "four billion, four hundred forty-seven million, seven hundred seventy-eight thousand, eight hundred sixty-nine".