126665618 has 8 divisors (see below), whose sum is σ = 190048140. Its totient is φ = 63316240.

The previous prime is 126665599. The next prime is 126665639. The reversal of 126665618 is 816566621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 95785369 + 30880249 = 9787^2 + 5557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 6668 + ... + 17256.

Almost surely, 2^126665618 is an apocalyptic number.

126665618 is a deficient number, since it is larger than the sum of its proper divisors (63382522).

126665618 is a wasteful number, since it uses less digits than its factorization.

126665618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16572.

The product of its digits is 103680, while the sum is 41.

The square root of 126665618 is about 11254.5820890871. The cubic root of 126665618 is about 502.2110322607.

The spelling of 126665618 in words is "one hundred twenty-six million, six hundred sixty-five thousand, six hundred eighteen".