13649515865 has 8 divisors (see below), whose sum is σ = 16384359240. Its totient is φ = 10916319232.

The previous prime is 13649515823. The next prime is 13649515879. The reversal of 13649515865 is 56851594631.

It is a happy number.

13649515865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 59552089 + 13589963776 = 7717^2 + 116576^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13649515865 - 2⁶ = 13649515801 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393374 + ... + 426663.

It is an arithmetic number, because the mean of its divisors is an integer number (2048044905).

Almost surely, 2^13649515865 is an apocalyptic number.

It is an amenable number.

13649515865 is a deficient number, since it is larger than the sum of its proper divisors (2734843375).

13649515865 is an equidigital number, since it uses as much as digits as its factorization.

13649515865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823371.

The product of its digits is 3888000, while the sum is 53.

The spelling of 13649515865 in words is "thirteen billion, six hundred forty-nine million, five hundred fifteen thousand, eight hundred sixty-five".