18429456808969 has 2 divisors, whose sum is σ = 18429456808970. Its totient is φ = 18429456808968.

The previous prime is 18429456808967. The next prime is 18429456809041. The reversal of 18429456808969 is 96980865492481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17230070431744 + 1199386377225 = 4150912^2 + 1095165^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429456808969 - 2¹ = 18429456808967 is a prime.

It is a super-2 number, since 2×18429456808969² (a number of 27 digits) contains 22 as substring.

Together with 18429456808967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18429456808967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214728404484 + 9214728404485.

It is an arithmetic number, because the mean of its divisors is an integer number (9214728404485).

Almost surely, 2^{18429456808969} is an apocalyptic number.

It is an amenable number.

18429456808969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429456808969 is an equidigital number, since it uses as much as digits as its factorization.

18429456808969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2149908480, while the sum is 79.

The spelling of 18429456808969 in words is "eighteen trillion, four hundred twenty-nine billion, four hundred fifty-six million, eight hundred eight thousand, nine hundred sixty-nine".