12455566678 has 4 divisors (see below), whose sum is σ = 18683350020. Its totient is φ = 6227783338.

The previous prime is 12455566639. The next prime is 12455566691. The reversal of 12455566678 is 87666555421.

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

It is a super-2 number, since 2×12455566678² (a number of 21 digits) contains 22 as substring.

It is a plaindrome in base 10.

It is a congruent number.

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, 3113891668 + ... + 3113891671.

It is an arithmetic number, because the mean of its divisors is an integer number (4670837505).

Almost surely, 2^12455566678 is an apocalyptic number.

12455566678 is a deficient number, since it is larger than the sum of its proper divisors (6227783342).

12455566678 is an equidigital number, since it uses as much as digits as its factorization.

12455566678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227783341.

The product of its digits is 12096000, while the sum is 55.

The spelling of 12455566678 in words is "twelve billion, four hundred fifty-five million, five hundred sixty-six thousand, six hundred seventy-eight".