126316665 has 40 divisors (see below), whose sum is σ = 230191368. Its totient is φ = 66251520.

The previous prime is 126316633. The next prime is 126316669. The reversal of 126316665 is 566613621.

It can be written as a sum of positive squares in 4 ways, for example, as 12766329 + 113550336 = 3573^2 + 10656^2 .

It is not a de Polignac number, because 126316665 - 2⁵ = 126316633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126316669) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22149 + ... + 27261.

Almost surely, 2^126316665 is an apocalyptic number.

126316665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126316665 is a deficient number, since it is larger than the sum of its proper divisors (103874703).

126316665 is an equidigital number, since it uses as much as digits as its factorization.

126316665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191 (or 5182 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 126316665 is about 11239.0686891753. The cubic root of 126316665 is about 501.7494252174.

The spelling of 126316665 in words is "one hundred twenty-six million, three hundred sixteen thousand, six hundred sixty-five".