13664264355605 has 4 divisors (see below), whose sum is σ = 16397117226732. Its totient is φ = 10931411484480.

The previous prime is 13664264355601. The next prime is 13664264355613. The reversal of 13664264355605 is 50655346246631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4784955002116 + 8879309353489 = 2187454^2 + 2979817^2 .

It is not a de Polignac number, because 13664264355605 - 2² = 13664264355601 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 (13664264355601) 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, 1366426435556 + ... + 1366426435565.

It is an arithmetic number, because the mean of its divisors is an integer number (4099279306683).

Almost surely, 2^{13664264355605} is an apocalyptic number.

It is an amenable number.

13664264355605 is a deficient number, since it is larger than the sum of its proper divisors (2732852871127).

13664264355605 is an equidigital number, since it uses as much as digits as its factorization.

13664264355605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732852871126.

The product of its (nonzero) digits is 46656000, while the sum is 56.

The spelling of 13664264355605 in words is "thirteen trillion, six hundred sixty-four billion, two hundred sixty-four million, three hundred fifty-five thousand, six hundred five".