12783549645 has 24 divisors (see below), whose sum is σ = 22470244992. Its totient is φ = 6721864800.

The previous prime is 12783549641. The next prime is 12783549673. The reversal of 12783549645 is 54694538721.

It is a happy number.

12783549645 is a `hidden beast` number, since 12 + 7 + 83 + 549 + 6 + 4 + 5 = 666.

It is not a de Polignac number, because 12783549645 - 2² = 12783549641 is a prime.

It is a super-3 number, since 3×12783549645³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12783549591 and 12783549600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12783549641) 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 23 ways as a sum of consecutive naturals, for example, 1997361 + ... + 2003750.

It is an arithmetic number, because the mean of its divisors is an integer number (936260208).

Almost surely, 2^12783549645 is an apocalyptic number.

12783549645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12783549645 is a deficient number, since it is larger than the sum of its proper divisors (9686695347).

12783549645 is a wasteful number, since it uses less digits than its factorization.

12783549645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001193 (or 4001190 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 12783549645 in words is "twelve billion, seven hundred eighty-three million, five hundred forty-nine thousand, six hundred forty-five".