12138723368 has 8 divisors (see below), whose sum is σ = 22760106330. Its totient is φ = 6069361680.

The previous prime is 12138723361. The next prime is 12138723383. The reversal of 12138723368 is 86332783121.

It can be written as a sum of positive squares in only one way, i.e., 10630022404 + 1508700964 = 103102^2 + 38842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (12138723361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758670203 + ... + 758670218.

Almost surely, 2^12138723368 is an apocalyptic number.

It is an amenable number.

12138723368 is a deficient number, since it is larger than the sum of its proper divisors (10621382962).

12138723368 is a wasteful number, since it uses less digits than its factorization.

12138723368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517340427 (or 1517340423 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The spelling of 12138723368 in words is "twelve billion, one hundred thirty-eight million, seven hundred twenty-three thousand, three hundred sixty-eight".