12055991578 has 4 divisors (see below), whose sum is σ = 18083987370. Its totient is φ = 6027995788.

The previous prime is 12055991527. The next prime is 12055991593. The reversal of 12055991578 is 87519955021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87519955021 = 61 ⋅1434753361.

It can be written as a sum of positive squares in only one way, i.e., 9795654729 + 2260336849 = 98973^2 + 47543^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3013997893 + ... + 3013997896.

Almost surely, 2^12055991578 is an apocalyptic number.

12055991578 is a deficient number, since it is larger than the sum of its proper divisors (6027995792).

12055991578 is an equidigital number, since it uses as much as digits as its factorization.

12055991578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6027995791.

The product of its (nonzero) digits is 1134000, while the sum is 52.

The spelling of 12055991578 in words is "twelve billion, fifty-five million, nine hundred ninety-one thousand, five hundred seventy-eight".