13660326503 has 4 divisors (see below), whose sum is σ = 13662175680. Its totient is φ = 13658477328.

The previous prime is 13660326499. The next prime is 13660326509. The reversal of 13660326503 is 30562306631.

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 13660326503 - 2² = 13660326499 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 (13660326509) 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, 913463 + ... + 928296.

It is an arithmetic number, because the mean of its divisors is an integer number (3415543920).

Almost surely, 2^13660326503 is an apocalyptic number.

13660326503 is a deficient number, since it is larger than the sum of its proper divisors (1849177).

13660326503 is an equidigital number, since it uses as much as digits as its factorization.

13660326503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849176.

The product of its (nonzero) digits is 58320, while the sum is 35.

The spelling of 13660326503 in words is "thirteen billion, six hundred sixty million, three hundred twenty-six thousand, five hundred three".