13275440664 has 72 divisors (see below), whose sum is σ = 34414934580. Its totient is φ = 4267287360.

The previous prime is 13275440617. The next prime is 13275440669. The reversal of 13275440664 is 46604457231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13275440669) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16368819 + ... + 16369629.

Almost surely, 2^13275440664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13275440664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17207467290).

13275440664 is an abundant number, since it is smaller than the sum of its proper divisors (21139493916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13275440664 is an frugal number, since it uses more digits than its factorization.

13275440664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

Adding to 13275440664 its reverse (46604457231), we get a palindrome (59879897895).

The spelling of 13275440664 in words is "thirteen billion, two hundred seventy-five million, four hundred forty thousand, six hundred sixty-four".