18191424329 has 16 divisors (see below), whose sum is σ = 20327722128. Its totient is φ = 16169766912.

The previous prime is 18191424319. The next prime is 18191424341. The reversal of 18191424329 is 92342419181.

It can be written as a sum of positive squares in 8 ways, for example, as 25775929 + 18165648400 = 5077^2 + 134780^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18191424329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18191424329.

It is not an unprimeable number, because it can be changed into a prime (18191424319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148292 + ... + 241605.

It is an arithmetic number, because the mean of its divisors is an integer number (1270482633).

Almost surely, 2^18191424329 is an apocalyptic number.

It is an amenable number.

18191424329 is a deficient number, since it is larger than the sum of its proper divisors (2136297799).

18191424329 is a wasteful number, since it uses less digits than its factorization.

18191424329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390044.

The product of its digits is 124416, while the sum is 44.

The spelling of 18191424329 in words is "eighteen billion, one hundred ninety-one million, four hundred twenty-four thousand, three hundred twenty-nine".