12617989891 has 8 divisors (see below), whose sum is σ = 13920034464. Its totient is φ = 11363292480.

The previous prime is 12617989847. The next prime is 12617989933. The reversal of 12617989891 is 19898971621.

12617989891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12617989891 - 2⁹ = 12617989379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12617989841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11836231 + ... + 11837296.

It is an arithmetic number, because the mean of its divisors is an integer number (1740004308).

Almost surely, 2^12617989891 is an apocalyptic number.

12617989891 is a deficient number, since it is larger than the sum of its proper divisors (1302044573).

12617989891 is a wasteful number, since it uses less digits than its factorization.

12617989891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23673581.

The product of its digits is 3919104, while the sum is 61.

The spelling of 12617989891 in words is "twelve billion, six hundred seventeen million, nine hundred eighty-nine thousand, eight hundred ninety-one".