13664156573 has 4 divisors (see below), whose sum is σ = 14033458140. Its totient is φ = 13294855008.

The previous prime is 13664156531. The next prime is 13664156591. The reversal of 13664156573 is 37565146631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37565146631 = 8999 ⋅4174369.

It can be written as a sum of positive squares in 2 ways, for example, as 6316752484 + 7347404089 = 79478^2 + 85717^2 .

It is a cyclic number.

It is not a de Polignac number, because 13664156573 - 2⁶ = 13664156509 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 (13664156873) 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, 184650728 + ... + 184650801.

It is an arithmetic number, because the mean of its divisors is an integer number (3508364535).

Almost surely, 2^13664156573 is an apocalyptic number.

It is an amenable number.

13664156573 is a deficient number, since it is larger than the sum of its proper divisors (369301567).

13664156573 is an equidigital number, since it uses as much as digits as its factorization.

13664156573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369301566.

The product of its digits is 1360800, while the sum is 47.

The spelling of 13664156573 in words is "thirteen billion, six hundred sixty-four million, one hundred fifty-six thousand, five hundred seventy-three".