13663600661 has 2 divisors, whose sum is σ = 13663600662.
Its totient is φ = 13663600660.
The previous prime is 13663600627. The next prime is 13663600669. The reversal of 13663600661 is 16600636631.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 13130868100 + 532732561 = 114590^2 + 23081^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-13663600661 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (13663600669) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6831800330 + 6831800331.
It is an arithmetic number, because the mean of its divisors is an integer number (6831800331).
Almost surely, 213663600661 is an apocalyptic number.
It is an amenable number.
13663600661 is a deficient number, since it is larger than the sum of its proper divisors (1).
13663600661 is an equidigital number, since it uses as much as digits as its factorization.
13663600661 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 69984, while the sum is 38.
The spelling of 13663600661 in words is "thirteen billion, six hundred sixty-three million, six hundred thousand, six hundred sixty-one".