13567680661 has 2 divisors, whose sum is σ = 13567680662. Its totient is φ = 13567680660.

The previous prime is 13567680649. The next prime is 13567680697. The reversal of 13567680661 is 16608676531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10810800625 + 2756880036 = 103975^2 + 52506^2 .

It is a cyclic number.

It is not a de Polignac number, because 13567680661 - 2⁵ = 13567680629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13567681661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6783840330 + 6783840331.

It is an arithmetic number, because the mean of its divisors is an integer number (6783840331).

Almost surely, 2^13567680661 is an apocalyptic number.

It is an amenable number.

13567680661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13567680661 is an equidigital number, since it uses as much as digits as its factorization.

13567680661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 13567680661 in words is "thirteen billion, five hundred sixty-seven million, six hundred eighty thousand, six hundred sixty-one".