12690942661 has 2 divisors, whose sum is σ = 12690942662. Its totient is φ = 12690942660.

The previous prime is 12690942653. The next prime is 12690942767. The reversal of 12690942661 is 16624909621.

12690942661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8626880161 + 4064062500 = 92881^2 + 63750^2 .

It is an emirp because it is prime and its reverse (16624909621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12690942661 - 2³ = 12690942653 is a prime.

It is a super-2 number, since 2×12690942661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12690942601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345471330 + 6345471331.

It is an arithmetic number, because the mean of its divisors is an integer number (6345471331).

Almost surely, 2^12690942661 is an apocalyptic number.

It is an amenable number.

12690942661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12690942661 is an equidigital number, since it uses as much as digits as its factorization.

12690942661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 12690942661 in words is "twelve billion, six hundred ninety million, nine hundred forty-two thousand, six hundred sixty-one".