126665599 has 2 divisors, whose sum is σ = 126665600. Its totient is φ = 126665598.

The previous prime is 126665593. The next prime is 126665639. The reversal of 126665599 is 995566621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126665599 - 2⁷ = 126665471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126665593) 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, 63332799 + 63332800.

It is an arithmetic number, because the mean of its divisors is an integer number (63332800).

Almost surely, 2^126665599 is an apocalyptic number.

126665599 is a deficient number, since it is larger than the sum of its proper divisors (1).

126665599 is an equidigital number, since it uses as much as digits as its factorization.

126665599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 126665599 is about 11254.5812449864. The cubic root of 126665599 is about 502.2110071499.

The spelling of 126665599 in words is "one hundred twenty-six million, six hundred sixty-five thousand, five hundred ninety-nine".