12638123356 has 6 divisors (see below), whose sum is σ = 22116715880. Its totient is φ = 6319061676.

The previous prime is 12638123341. The next prime is 12638123359. The reversal of 12638123356 is 65332183621.

It is a super-2 number, since 2×12638123356² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638123359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1579765416 + ... + 1579765423.

Almost surely, 2^12638123356 is an apocalyptic number.

It is an amenable number.

12638123356 is a deficient number, since it is larger than the sum of its proper divisors (9478592524).

12638123356 is a wasteful number, since it uses less digits than its factorization.

12638123356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159530843 (or 3159530841 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The spelling of 12638123356 in words is "twelve billion, six hundred thirty-eight million, one hundred twenty-three thousand, three hundred fifty-six".