126665771 has 2 divisors, whose sum is σ = 126665772. Its totient is φ = 126665770.

The previous prime is 126665767. The next prime is 126665821. The reversal of 126665771 is 177566621.

It is a weak prime.

It is an emirp because it is prime and its reverse (177566621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126665771 - 2² = 126665767 is a prime.

It is not a weakly prime, because it can be changed into another prime (126665471) 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, 63332885 + 63332886.

It is an arithmetic number, because the mean of its divisors is an integer number (63332886).

Almost surely, 2^126665771 is an apocalyptic number.

126665771 is a deficient number, since it is larger than the sum of its proper divisors (1).

126665771 is an equidigital number, since it uses as much as digits as its factorization.

126665771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 126665771 is about 11254.5888863165. The cubic root of 126665771 is about 502.2112344683.

The spelling of 126665771 in words is "one hundred twenty-six million, six hundred sixty-five thousand, seven hundred seventy-one".