13661337689 has 2 divisors, whose sum is σ = 13661337690. Its totient is φ = 13661337688.

The previous prime is 13661337667. The next prime is 13661337707. The reversal of 13661337689 is 98673316631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12186393664 + 1474944025 = 110392^2 + 38405^2 .

It is a cyclic number.

It is not a de Polignac number, because 13661337689 - 2⁸ = 13661337433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13661337689.

It is not a weakly prime, because it can be changed into another prime (13661337619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830668844 + 6830668845.

It is an arithmetic number, because the mean of its divisors is an integer number (6830668845).

Almost surely, 2^13661337689 is an apocalyptic number.

It is an amenable number.

13661337689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661337689 is an equidigital number, since it uses as much as digits as its factorization.

13661337689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 53.

The spelling of 13661337689 in words is "thirteen billion, six hundred sixty-one million, three hundred thirty-seven thousand, six hundred eighty-nine".