13217710645 has 4 divisors (see below), whose sum is σ = 15861252780. Its totient is φ = 10574168512.

The previous prime is 13217710643. The next prime is 13217710657. The reversal of 13217710645 is 54601771231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54601771231 = 7 ⋅7800253033.

It can be written as a sum of positive squares in 2 ways, for example, as 9159638436 + 4058072209 = 95706^2 + 63703^2 .

It is a cyclic number.

It is not a de Polignac number, because 13217710645 - 2¹ = 13217710643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13217710643) 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, 1321771060 + ... + 1321771069.

It is an arithmetic number, because the mean of its divisors is an integer number (3965313195).

Almost surely, 2^13217710645 is an apocalyptic number.

It is an amenable number.

13217710645 is a deficient number, since it is larger than the sum of its proper divisors (2643542135).

13217710645 is an equidigital number, since it uses as much as digits as its factorization.

13217710645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643542134.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 13217710645 in words is "thirteen billion, two hundred seventeen million, seven hundred ten thousand, six hundred forty-five".