12640365503 has 4 divisors (see below), whose sum is σ = 12681539640. Its totient is φ = 12599191368.

The previous prime is 12640365481. The next prime is 12640365523. The reversal of 12640365503 is 30556304621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30556304621 = 19 ⋅1608226559.

It is a cyclic number.

It is not a de Polignac number, because 12640365503 - 2²⁴ = 12623588287 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 (12640365523) 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, 20586608 + ... + 20587221.

It is an arithmetic number, because the mean of its divisors is an integer number (3170384910).

Almost surely, 2^12640365503 is an apocalyptic number.

12640365503 is a deficient number, since it is larger than the sum of its proper divisors (41174137).

12640365503 is an equidigital number, since it uses as much as digits as its factorization.

12640365503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41174136.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 12640365503 in words is "twelve billion, six hundred forty million, three hundred sixty-five thousand, five hundred three".