12181734785 has 16 divisors (see below), whose sum is σ = 15959979072. Its totient is φ = 8852232000.

The previous prime is 12181734781. The next prime is 12181734793. The reversal of 12181734785 is 58743718121.

It is not a de Polignac number, because 12181734785 - 2² = 12181734781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181734781) 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, 21491 + ... + 157560.

It is an arithmetic number, because the mean of its divisors is an integer number (997498692).

Almost surely, 2^12181734785 is an apocalyptic number.

It is an amenable number.

12181734785 is a deficient number, since it is larger than the sum of its proper divisors (3778244287).

12181734785 is a wasteful number, since it uses less digits than its factorization.

12181734785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180304.

The product of its digits is 376320, while the sum is 47.

The spelling of 12181734785 in words is "twelve billion, one hundred eighty-one million, seven hundred thirty-four thousand, seven hundred eighty-five".