13863604991 has 4 divisors (see below), whose sum is σ = 13863861984. Its totient is φ = 13863348000.

The previous prime is 13863604973. The next prime is 13863605059. The reversal of 13863604991 is 19940636831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19940636831 = 613 ⋅32529587.

It is a cyclic number.

It is not a de Polignac number, because 13863604991 - 2⁶ = 13863604927 is a prime.

It is a super-2 number, since 2×13863604991² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13863604901) 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, 12935 + ... + 167016.

It is an arithmetic number, because the mean of its divisors is an integer number (3465965496).

Almost surely, 2^13863604991 is an apocalyptic number.

13863604991 is a deficient number, since it is larger than the sum of its proper divisors (256993).

13863604991 is an equidigital number, since it uses as much as digits as its factorization.

13863604991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256992.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 13863604991 in words is "thirteen billion, eight hundred sixty-three million, six hundred four thousand, nine hundred ninety-one".