12171312783 has 96 divisors (see below), whose sum is σ = 21500743680. Its totient is φ = 6488501760.

The previous prime is 12171312781. The next prime is 12171312827. The reversal of 12171312783 is 38721317121.

It is a happy number.

It is not a de Polignac number, because 12171312783 - 2¹ = 12171312781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171312781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6106035 + ... + 6108027.

It is an arithmetic number, because the mean of its divisors is an integer number (223966080).

Almost surely, 2^12171312783 is an apocalyptic number.

12171312783 is a deficient number, since it is larger than the sum of its proper divisors (9329430897).

12171312783 is a wasteful number, since it uses less digits than its factorization.

12171312783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149 (or 2146 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The spelling of 12171312783 in words is "twelve billion, one hundred seventy-one million, three hundred twelve thousand, seven hundred eighty-three".