13003440661 has 8 divisors (see below), whose sum is σ = 13316052024. Its totient is φ = 12693320640.

The previous prime is 13003440629. The next prime is 13003440673. The reversal of 13003440661 is 16604430031.

It can be written as a sum of positive squares in 4 ways, for example, as 3341533636 + 9661907025 = 57806^2 + 98295^2 .

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 13003440661 - 2⁵ = 13003440629 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 (13003440161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612270 + ... + 633151.

It is an arithmetic number, because the mean of its divisors is an integer number (1664506503).

Almost surely, 2^13003440661 is an apocalyptic number.

It is an amenable number.

13003440661 is a deficient number, since it is larger than the sum of its proper divisors (312611363).

13003440661 is a wasteful number, since it uses less digits than its factorization.

13003440661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245671.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 13003440661 its reverse (16604430031), we get a palindrome (29607870692).

The spelling of 13003440661 in words is "thirteen billion, three million, four hundred forty thousand, six hundred sixty-one".