6447688469 has 2 divisors, whose sum is σ = 6447688470. Its totient is φ = 6447688468.

The previous prime is 6447688441. The next prime is 6447688477. The reversal of 6447688469 is 9648867446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6192903025 + 254785444 = 78695^2 + 15962^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447688469 - 2¹⁶ = 6447622933 is a prime.

It is a super-2 number, since 2×6447688469² = 83145373186551127922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6447688409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3223844234 + 3223844235.

It is an arithmetic number, because the mean of its divisors is an integer number (3223844235).

Almost surely, 2^6447688469 is an apocalyptic number.

It is an amenable number.

6447688469 is a deficient number, since it is larger than the sum of its proper divisors (1).

6447688469 is an equidigital number, since it uses as much as digits as its factorization.

6447688469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 62.

The square root of 6447688469 is about 80297.4997680501. The cubic root of 6447688469 is about 1861.2355906478.

The spelling of 6447688469 in words is "six billion, four hundred forty-seven million, six hundred eighty-eight thousand, four hundred sixty-nine".