18343069649 has 4 divisors (see below), whose sum is σ = 19422073764. Its totient is φ = 17264065536.

The previous prime is 18343069627. The next prime is 18343069669. The reversal of 18343069649 is 94696034381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94696034381 = 13 ⋅7284310337.

It can be written as a sum of positive squares in 2 ways, for example, as 6720720400 + 11622349249 = 81980^2 + 107807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18343069649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18343069649.

It is not an unprimeable number, because it can be changed into a prime (18343069669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539502032 + ... + 539502065.

It is an arithmetic number, because the mean of its divisors is an integer number (4855518441).

Almost surely, 2^18343069649 is an apocalyptic number.

It is an amenable number.

18343069649 is a deficient number, since it is larger than the sum of its proper divisors (1079004115).

18343069649 is a wasteful number, since it uses less digits than its factorization.

18343069649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079004114.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 18343069649 in words is "eighteen billion, three hundred forty-three million, sixty-nine thousand, six hundred forty-nine".