12665156338 has 4 divisors (see below), whose sum is σ = 18997734510. Its totient is φ = 6332578168.

The previous prime is 12665156327. The next prime is 12665156359. The reversal of 12665156338 is 83365156621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83365156621 = 23 ⋅3624572027.

It can be written as a sum of positive squares in only one way, i.e., 12628590129 + 36566209 = 112377^2 + 6047^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3166289083 + ... + 3166289086.

Almost surely, 2^12665156338 is an apocalyptic number.

12665156338 is a deficient number, since it is larger than the sum of its proper divisors (6332578172).

12665156338 is an equidigital number, since it uses as much as digits as its factorization.

12665156338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332578171.

The product of its digits is 777600, while the sum is 46.

The spelling of 12665156338 in words is "twelve billion, six hundred sixty-five million, one hundred fifty-six thousand, three hundred thirty-eight".