12739168538 has 4 divisors (see below), whose sum is σ = 19108752810. Its totient is φ = 6369584268.

The previous prime is 12739168531. The next prime is 12739168573. The reversal of 12739168538 is 83586193721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83586193721 = 1229 ⋅68011549.

It can be written as a sum of positive squares in only one way, i.e., 12738959689 + 208849 = 112867^2 + 457^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12739168538.

It is not an unprimeable number, because it can be changed into a prime (12739168531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3184792133 + ... + 3184792136.

Almost surely, 2^12739168538 is an apocalyptic number.

12739168538 is a deficient number, since it is larger than the sum of its proper divisors (6369584272).

12739168538 is an equidigital number, since it uses as much as digits as its factorization.

12739168538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369584271.

The product of its digits is 2177280, while the sum is 53.

The spelling of 12739168538 in words is "twelve billion, seven hundred thirty-nine million, one hundred sixty-eight thousand, five hundred thirty-eight".