18873478469 has 2 divisors, whose sum is σ = 18873478470. Its totient is φ = 18873478468.

The previous prime is 18873478457. The next prime is 18873478493. The reversal of 18873478469 is 96487437881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11030250625 + 7843227844 = 105025^2 + 88562^2 .

It is a cyclic number.

It is not a de Polignac number, because 18873478469 - 2⁴ = 18873478453 is a prime.

It is a super-2 number, since 2×18873478469² (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 (18873478669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436739234 + 9436739235.

It is an arithmetic number, because the mean of its divisors is an integer number (9436739235).

Almost surely, 2^18873478469 is an apocalyptic number.

It is an amenable number.

18873478469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18873478469 is an equidigital number, since it uses as much as digits as its factorization.

18873478469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65028096, while the sum is 65.

The spelling of 18873478469 in words is "eighteen billion, eight hundred seventy-three million, four hundred seventy-eight thousand, four hundred sixty-nine".