13664503973 has 4 divisors (see below), whose sum is σ = 13683997548. Its totient is φ = 13645010400.

The previous prime is 13664503943. The next prime is 13664504011. The reversal of 13664503973 is 37930546631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37930546631 = 14083 ⋅2693357.

It can be written as a sum of positive squares in 2 ways, for example, as 12177784609 + 1486719364 = 110353^2 + 38558^2 .

It is a cyclic number.

It is not a de Polignac number, because 13664503973 - 2¹⁴ = 13664487589 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 (13664503943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9745736 + ... + 9747137.

It is an arithmetic number, because the mean of its divisors is an integer number (3420999387).

Almost surely, 2^13664503973 is an apocalyptic number.

It is an amenable number.

13664503973 is a deficient number, since it is larger than the sum of its proper divisors (19493575).

13664503973 is an equidigital number, since it uses as much as digits as its factorization.

13664503973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19493574.

The product of its (nonzero) digits is 1224720, while the sum is 47.

The spelling of 13664503973 in words is "thirteen billion, six hundred sixty-four million, five hundred three thousand, nine hundred seventy-three".