12990555538 has 8 divisors (see below), whose sum is σ = 19961097660. Its totient is φ = 6336856320.

The previous prime is 12990555533. The next prime is 12990555629. The reversal of 12990555538 is 83555509921.

It can be written as a sum of positive squares in 2 ways, for example, as 10358557729 + 2631997809 = 101777^2 + 51303^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12990555533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79210623 + ... + 79210786.

Almost surely, 2^12990555538 is an apocalyptic number.

12990555538 is a deficient number, since it is larger than the sum of its proper divisors (6970542122).

12990555538 is a wasteful number, since it uses less digits than its factorization.

12990555538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158421452.

The product of its (nonzero) digits is 2430000, while the sum is 52.

The spelling of 12990555538 in words is "twelve billion, nine hundred ninety million, five hundred fifty-five thousand, five hundred thirty-eight".