12685554194 has 4 divisors (see below), whose sum is σ = 19028331294. Its totient is φ = 6342777096.

The previous prime is 12685554191. The next prime is 12685554197. The reversal of 12685554194 is 49145558621.

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

It is an interprime number because it is at equal distance from previous prime (12685554191) and next prime (12685554197).

It can be written as a sum of positive squares in only one way, i.e., 6994813225 + 5690740969 = 83635^2 + 75437^2 .

It is not an unprimeable number, because it can be changed into a prime (12685554191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3171388547 + ... + 3171388550.

Almost surely, 2^12685554194 is an apocalyptic number.

12685554194 is a deficient number, since it is larger than the sum of its proper divisors (6342777100).

12685554194 is an equidigital number, since it uses as much as digits as its factorization.

12685554194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6342777099.

The product of its digits is 1728000, while the sum is 50.

The spelling of 12685554194 in words is "twelve billion, six hundred eighty-five million, five hundred fifty-four thousand, one hundred ninety-four".