13243500661 has 2 divisors, whose sum is σ = 13243500662. Its totient is φ = 13243500660.

The previous prime is 13243500659. The next prime is 13243500679. The reversal of 13243500661 is 16600534231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8083808100 + 5159692561 = 89910^2 + 71831^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243500661 - 2¹ = 13243500659 is a prime.

Together with 13243500659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13243500161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6621750330 + 6621750331.

It is an arithmetic number, because the mean of its divisors is an integer number (6621750331).

Almost surely, 2^13243500661 is an apocalyptic number.

It is an amenable number.

13243500661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13243500661 is an equidigital number, since it uses as much as digits as its factorization.

13243500661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 13243500661 in words is "thirteen billion, two hundred forty-three million, five hundred thousand, six hundred sixty-one".