12178178417 has 4 divisors (see below), whose sum is σ = 12212677860. Its totient is φ = 12143678976.

The previous prime is 12178178387. The next prime is 12178178431. The reversal of 12178178417 is 71487187121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3612490816 + 8565687601 = 60104^2 + 92551^2 .

It is a cyclic number.

It is not a de Polignac number, because 12178178417 - 2¹² = 12178174321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12178178917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17249192 + ... + 17249897.

It is an arithmetic number, because the mean of its divisors is an integer number (3053169465).

Almost surely, 2^12178178417 is an apocalyptic number.

It is an amenable number.

12178178417 is a deficient number, since it is larger than the sum of its proper divisors (34499443).

12178178417 is an equidigital number, since it uses as much as digits as its factorization.

12178178417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34499442.

The product of its digits is 175616, while the sum is 47.

The spelling of 12178178417 in words is "twelve billion, one hundred seventy-eight million, one hundred seventy-eight thousand, four hundred seventeen".