666581113 has 8 divisors (see below), whose sum is σ = 734380416. Its totient is φ = 599982000.

The previous prime is 666581093. The next prime is 666581117. The reversal of 666581113 is 311185666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666581113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666581117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298881 + ... + 301102.

It is an arithmetic number, because the mean of its divisors is an integer number (91797552).

Almost surely, 2^666581113 is an apocalyptic number.

It is an amenable number.

666581113 is a deficient number, since it is larger than the sum of its proper divisors (67799303).

666581113 is a wasteful number, since it uses less digits than its factorization.

666581113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600095.

The product of its digits is 25920, while the sum is 37.

The square root of 666581113 is about 25818.2321819291. The cubic root of 666581113 is about 873.5430941317.

It can be divided in two parts, 6665 and 81113, that added together give a palindrome (87778).

The spelling of 666581113 in words is "six hundred sixty-six million, five hundred eighty-one thousand, one hundred thirteen".