18319429543649 has 32 divisors (see below), whose sum is σ = 20353575037824. Its totient is φ = 16382956423680.

The previous prime is 18319429543619. The next prime is 18319429543651. The reversal of 18319429543649 is 94634592491381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18319429543649 - 2¹² = 18319429539553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18319429543619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 777454142 + ... + 777477704.

It is an arithmetic number, because the mean of its divisors is an integer number (636049219932).

Almost surely, 2^{18319429543649} is an apocalyptic number.

It is an amenable number.

18319429543649 is a deficient number, since it is larger than the sum of its proper divisors (2034145494175).

18319429543649 is a wasteful number, since it uses less digits than its factorization.

18319429543649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38337.

The product of its digits is 201553920, while the sum is 68.

The spelling of 18319429543649 in words is "eighteen trillion, three hundred nineteen billion, four hundred twenty-nine million, five hundred forty-three thousand, six hundred forty-nine".