18259785447 has 16 divisors (see below), whose sum is σ = 25142372352. Its totient is φ = 11775526560.

The previous prime is 18259785443. The next prime is 18259785463. The reversal of 18259785447 is 74458795281.

It is not a de Polignac number, because 18259785447 - 2² = 18259785443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18259785443) 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 in 15 ways as a sum of consecutive naturals, for example, 186358 + ... + 266924.

It is an arithmetic number, because the mean of its divisors is an integer number (1571398272).

Almost surely, 2^18259785447 is an apocalyptic number.

18259785447 is a deficient number, since it is larger than the sum of its proper divisors (6882586905).

18259785447 is a wasteful number, since it uses less digits than its factorization.

18259785447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83038.

The product of its digits is 22579200, while the sum is 60.

The spelling of 18259785447 in words is "eighteen billion, two hundred fifty-nine million, seven hundred eighty-five thousand, four hundred forty-seven".