18144589469 has 2 divisors, whose sum is σ = 18144589470. Its totient is φ = 18144589468.

The previous prime is 18144589459. The next prime is 18144589493. The reversal of 18144589469 is 96498544181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18141396100 + 3193369 = 134690^2 + 1787^2 .

It is a cyclic number.

It is not a de Polignac number, because 18144589469 - 2⁴ = 18144589453 is a prime.

It is a super-2 number, since 2×18144589469² (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 (18144589409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9072294734 + 9072294735.

It is an arithmetic number, because the mean of its divisors is an integer number (9072294735).

Almost surely, 2^18144589469 is an apocalyptic number.

It is an amenable number.

18144589469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18144589469 is an equidigital number, since it uses as much as digits as its factorization.

18144589469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 59.

The spelling of 18144589469 in words is "eighteen billion, one hundred forty-four million, five hundred eighty-nine thousand, four hundred sixty-nine".