13664038945 has 4 divisors (see below), whose sum is σ = 16396846740. Its totient is φ = 10931231152.

The previous prime is 13664038943. The next prime is 13664038991. The reversal of 13664038945 is 54983046631.

It is a happy number.

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 7143799441 + 6520239504 = 84521^2 + 80748^2 .

It is a cyclic number.

It is not a de Polignac number, because 13664038945 - 2¹ = 13664038943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13664038943) 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, 1366403890 + ... + 1366403899.

It is an arithmetic number, because the mean of its divisors is an integer number (4099211685).

Almost surely, 2^13664038945 is an apocalyptic number.

It is an amenable number.

13664038945 is a deficient number, since it is larger than the sum of its proper divisors (2732807795).

13664038945 is an equidigital number, since it uses as much as digits as its factorization.

13664038945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732807794.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 13664038945 in words is "thirteen billion, six hundred sixty-four million, thirty-eight thousand, nine hundred forty-five".