266642042437 has 2 divisors, whose sum is σ = 266642042438. Its totient is φ = 266642042436.

The previous prime is 266642042393. The next prime is 266642042453. The reversal of 266642042437 is 734240246662.

It is a happy number.

266642042437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217408645441 + 49233396996 = 466271^2 + 221886^2 .

It is a cyclic number.

It is not a de Polignac number, because 266642042437 - 2⁷ = 266642042309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266642042467) 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, 133321021218 + 133321021219.

It is an arithmetic number, because the mean of its divisors is an integer number (133321021219).

Almost surely, 2^266642042437 is an apocalyptic number.

It is an amenable number.

266642042437 is a deficient number, since it is larger than the sum of its proper divisors (1).

266642042437 is an equidigital number, since it uses as much as digits as its factorization.

266642042437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 46.

The spelling of 266642042437 in words is "two hundred sixty-six billion, six hundred forty-two million, forty-two thousand, four hundred thirty-seven".