13648713581 has 4 divisors (see below), whose sum is σ = 13852425792. Its totient is φ = 13445001372.

The previous prime is 13648713577. The next prime is 13648713599. The reversal of 13648713581 is 18531784631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18531784631 = 6269 ⋅2956099.

It is a cyclic number.

It is not a de Polignac number, because 13648713581 - 2² = 13648713577 is a prime.

It is a super-2 number, since 2×13648713581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13648713571) 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, 101856005 + ... + 101856138.

It is an arithmetic number, because the mean of its divisors is an integer number (3463106448).

Almost surely, 2^13648713581 is an apocalyptic number.

It is an amenable number.

13648713581 is a deficient number, since it is larger than the sum of its proper divisors (203712211).

13648713581 is an equidigital number, since it uses as much as digits as its factorization.

13648713581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203712210.

The product of its digits is 483840, while the sum is 47.

The spelling of 13648713581 in words is "thirteen billion, six hundred forty-eight million, seven hundred thirteen thousand, five hundred eighty-one".