13911218641 has 8 divisors (see below), whose sum is σ = 13951261160. Its totient is φ = 13871202048.

The previous prime is 13911218627. The next prime is 13911218669. The reversal of 13911218641 is 14681211931.

It can be written as a sum of positive squares in 4 ways, for example, as 9052571025 + 4858647616 = 95145^2 + 69704^2 .

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 13911218641 - 2⁹ = 13911218129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13911218641.

It is not an unprimeable number, because it can be changed into a prime (13911218611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1654075 + ... + 1662463.

It is an arithmetic number, because the mean of its divisors is an integer number (1743907645).

Almost surely, 2^13911218641 is an apocalyptic number.

It is an amenable number.

13911218641 is a deficient number, since it is larger than the sum of its proper divisors (40042519).

13911218641 is an equidigital number, since it uses as much as digits as its factorization.

13911218641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12963.

The product of its digits is 10368, while the sum is 37.

The spelling of 13911218641 in words is "thirteen billion, nine hundred eleven million, two hundred eighteen thousand, six hundred forty-one".