126665005 has 4 divisors (see below), whose sum is σ = 151998012. Its totient is φ = 101332000.

The previous prime is 126665003. The next prime is 126665027. The reversal of 126665005 is 500566621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37589161 + 89075844 = 6131^2 + 9438^2 .

It is not a de Polignac number, because 126665005 - 2¹ = 126665003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126665003) 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 in 3 ways as a sum of consecutive naturals, for example, 12666496 + ... + 12666505.

It is an arithmetic number, because the mean of its divisors is an integer number (37999503).

Almost surely, 2^126665005 is an apocalyptic number.

It is an amenable number.

126665005 is a deficient number, since it is larger than the sum of its proper divisors (25333007).

126665005 is an equidigital number, since it uses as much as digits as its factorization.

126665005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25333006.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 126665005 is about 11254.5548557018. The cubic root of 126665005 is about 502.2102221070.

It can be divided in two parts, 12666 and 5005, that added together give a palindrome (17671).

The spelling of 126665005 in words is "one hundred twenty-six million, six hundred sixty-five thousand, five".