13478820649 has 4 divisors (see below), whose sum is σ = 15404366464. Its totient is φ = 11553274836.

The previous prime is 13478820623. The next prime is 13478820659. The reversal of 13478820649 is 94602887431.

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.

It is a cyclic number.

It is not a de Polignac number, because 13478820649 - 2¹⁷ = 13478689577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13478820596 and 13478820605.

It is not an unprimeable number, because it can be changed into a prime (13478820659) 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, 962772897 + ... + 962772910.

It is an arithmetic number, because the mean of its divisors is an integer number (3851091616).

Almost surely, 2^13478820649 is an apocalyptic number.

It is an amenable number.

13478820649 is a deficient number, since it is larger than the sum of its proper divisors (1925545815).

13478820649 is an equidigital number, since it uses as much as digits as its factorization.

13478820649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925545814.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 13478820649 in words is "thirteen billion, four hundred seventy-eight million, eight hundred twenty thousand, six hundred forty-nine".