6438154669 has 2 divisors, whose sum is σ = 6438154670. Its totient is φ = 6438154668.

The previous prime is 6438154607. The next prime is 6438154673. The reversal of 6438154669 is 9664518346.

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., 6343326025 + 94828644 = 79645^2 + 9738^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438154669 - 2⁹ = 6438154157 is a prime.

It is a super-2 number, since 2×6438154669² = 82899671083932999122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6433154669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219077334 + 3219077335.

It is an arithmetic number, because the mean of its divisors is an integer number (3219077335).

Almost surely, 2^6438154669 is an apocalyptic number.

It is an amenable number.

6438154669 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438154669 is an equidigital number, since it uses as much as digits as its factorization.

6438154669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 52.

The square root of 6438154669 is about 80238.1123220132. The cubic root of 6438154669 is about 1860.3177732975.

The spelling of 6438154669 in words is "six billion, four hundred thirty-eight million, one hundred fifty-four thousand, six hundred sixty-nine".