12783231385 has 16 divisors (see below), whose sum is σ = 15703450560. Its totient is φ = 9986034240.

The previous prime is 12783231353. The next prime is 12783231397. The reversal of 12783231385 is 58313238721.

It is a happy number.

It is not a de Polignac number, because 12783231385 - 2⁵ = 12783231353 is a prime.

It is a super-2 number, since 2×12783231385² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58395 + ... + 170224.

It is an arithmetic number, because the mean of its divisors is an integer number (981465660).

Almost surely, 2^12783231385 is an apocalyptic number.

It is an amenable number.

12783231385 is a deficient number, since it is larger than the sum of its proper divisors (2920219175).

12783231385 is a wasteful number, since it uses less digits than its factorization.

12783231385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228888.

The product of its digits is 241920, while the sum is 43.

The spelling of 12783231385 in words is "twelve billion, seven hundred eighty-three million, two hundred thirty-one thousand, three hundred eighty-five".