13618545971 has 4 divisors (see below), whose sum is σ = 13623090000. Its totient is φ = 13614001944.

The previous prime is 13618545917. The next prime is 13618545977. The reversal of 13618545971 is 17954581631.

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

It is a cyclic number.

It is not a de Polignac number, because 13618545971 - 2¹⁸ = 13618283827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13618545977) 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, 2267516 + ... + 2273513.

It is an arithmetic number, because the mean of its divisors is an integer number (3405772500).

Almost surely, 2^13618545971 is an apocalyptic number.

13618545971 is a deficient number, since it is larger than the sum of its proper divisors (4544029).

13618545971 is an equidigital number, since it uses as much as digits as its factorization.

13618545971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544028.

The product of its digits is 907200, while the sum is 50.

The spelling of 13618545971 in words is "thirteen billion, six hundred eighteen million, five hundred forty-five thousand, nine hundred seventy-one".