13011402661 has 4 divisors (see below), whose sum is σ = 13017516300. Its totient is φ = 13005289024.

The previous prime is 13011402643. The next prime is 13011402707. The reversal of 13011402661 is 16620411031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9298937761 + 3712464900 = 96431^2 + 60930^2 .

It is a cyclic number.

It is not a de Polignac number, because 13011402661 - 2¹¹ = 13011400613 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 (13011402461) 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, 3053626 + ... + 3057883.

It is an arithmetic number, because the mean of its divisors is an integer number (3254379075).

Almost surely, 2^13011402661 is an apocalyptic number.

It is an amenable number.

13011402661 is a deficient number, since it is larger than the sum of its proper divisors (6113639).

13011402661 is an equidigital number, since it uses as much as digits as its factorization.

13011402661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113638.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 13011402661 its reverse (16620411031), we get a palindrome (29631813692).

The spelling of 13011402661 in words is "thirteen billion, eleven million, four hundred two thousand, six hundred sixty-one".