13665025623 has 4 divisors (see below), whose sum is σ = 18220034168. Its totient is φ = 9110017080.

The previous prime is 13665025613. The next prime is 13665025631. The reversal of 13665025623 is 32652056631.

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

It is not a de Polignac number, because 13665025623 - 2⁴ = 13665025607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665025613) 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, 2277504268 + ... + 2277504273.

It is an arithmetic number, because the mean of its divisors is an integer number (4555008542).

Almost surely, 2^13665025623 is an apocalyptic number.

13665025623 is a deficient number, since it is larger than the sum of its proper divisors (4555008545).

13665025623 is an equidigital number, since it uses as much as digits as its factorization.

13665025623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555008544.

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 13665025623 in words is "thirteen billion, six hundred sixty-five million, twenty-five thousand, six hundred twenty-three".