12783620812 has 18 divisors (see below), whose sum is σ = 23610748308. Its totient is φ = 6055398648.

The previous prime is 12783620797. The next prime is 12783620827. The reversal of 12783620812 is 21802638721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12783620797) and next prime (12783620827).

It is a super-2 number, since 2×12783620812² (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 5 ways as a sum of consecutive naturals, for example, 4425018 + ... + 4427905.

Almost surely, 2^12783620812 is an apocalyptic number.

It is an amenable number.

12783620812 is a deficient number, since it is larger than the sum of its proper divisors (10827127496).

12783620812 is a wasteful number, since it uses less digits than its factorization.

12783620812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852965 (or 8852944 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 12783620812 in words is "twelve billion, seven hundred eighty-three million, six hundred twenty thousand, eight hundred twelve".