666113618 has 8 divisors (see below), whose sum is σ = 1057945212. Its totient is φ = 313465216.

The previous prime is 666113579. The next prime is 666113621. The reversal of 666113618 is 816311666.

It can be written as a sum of positive squares in 2 ways, for example, as 658589569 + 7524049 = 25663^2 + 2743^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9795755 + ... + 9795822.

Almost surely, 2^666113618 is an apocalyptic number.

666113618 is a deficient number, since it is larger than the sum of its proper divisors (391831594).

666113618 is a wasteful number, since it uses less digits than its factorization.

666113618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591596.

The product of its digits is 31104, while the sum is 38.

The square root of 666113618 is about 25809.1770112881. The cubic root of 666113618 is about 873.3388316509.

The spelling of 666113618 in words is "six hundred sixty-six million, one hundred thirteen thousand, six hundred eighteen".