8468668639 has 2 divisors, whose sum is σ = 8468668640. Its totient is φ = 8468668638.

The previous prime is 8468668627. The next prime is 8468668673. The reversal of 8468668639 is 9368668648.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8468668639 - 2⁷ = 8468668511 is a prime.

It is a super-2 number, since 2×8468668639² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8468668339) 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, 4234334319 + 4234334320.

It is an arithmetic number, because the mean of its divisors is an integer number (4234334320).

Almost surely, 2^8468668639 is an apocalyptic number.

8468668639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8468668639 is an equidigital number, since it uses as much as digits as its factorization.

8468668639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71663616, while the sum is 64.

The square root of 8468668639 is about 92025.3695401437. The cubic root of 8468668639 is about 2038.3169380093.

Subtracting 8468668639 from its reverse (9368668648), we obtain a palindrome (900000009).

The spelling of 8468668639 in words is "eight billion, four hundred sixty-eight million, six hundred sixty-eight thousand, six hundred thirty-nine".