12643772281 has 24 divisors (see below), whose sum is σ = 15498336480. Its totient is φ = 10256404032.

The previous prime is 12643772269. The next prime is 12643772293. The reversal of 12643772281 is 18227734621.

It is an interprime number because it is at equal distance from previous prime (12643772269) and next prime (12643772293).

It is not a de Polignac number, because 12643772281 - 2¹⁷ = 12643641209 is a prime.

It is a super-2 number, since 2×12643772281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12643772231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 955150 + ... + 968296.

It is an arithmetic number, because the mean of its divisors is an integer number (645764020).

Almost surely, 2^12643772281 is an apocalyptic number.

It is an amenable number.

12643772281 is a deficient number, since it is larger than the sum of its proper divisors (2854564199).

12643772281 is a wasteful number, since it uses less digits than its factorization.

12643772281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14213 (or 14206 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The spelling of 12643772281 in words is "twelve billion, six hundred forty-three million, seven hundred seventy-two thousand, two hundred eighty-one".