12724477765138 has 4 divisors (see below), whose sum is σ = 19086716647710. Its totient is φ = 6362238882568.

The previous prime is 12724477765133. The next prime is 12724477765177. The reversal of 12724477765138 is 83156777442721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12701333315449 + 23144449689 = 3563893^2 + 152133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12724477765138.

It is not an unprimeable number, because it can be changed into a prime (12724477765133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3181119441283 + ... + 3181119441286.

Almost surely, 2^{12724477765138} is an apocalyptic number.

12724477765138 is a deficient number, since it is larger than the sum of its proper divisors (6362238882572).

12724477765138 is an equidigital number, since it uses as much as digits as its factorization.

12724477765138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6362238882571.

The product of its digits is 110638080, while the sum is 64.

The spelling of 12724477765138 in words is "twelve trillion, seven hundred twenty-four billion, four hundred seventy-seven million, seven hundred sixty-five thousand, one hundred thirty-eight".