666049931 has 8 divisors (see below), whose sum is σ = 690979680. Its totient is φ = 641251072.

The previous prime is 666049897. The next prime is 666049949. The reversal of 666049931 is 139940666.

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

It is a cyclic number.

It is not a de Polignac number, because 666049931 - 2²⁶ = 598941067 is a prime.

It is a super-2 number, since 2×666049931² = 887245021170209522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666049991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22295 + ... + 42768.

It is an arithmetic number, because the mean of its divisors is an integer number (86372460).

Almost surely, 2^666049931 is an apocalyptic number.

666049931 is a deficient number, since it is larger than the sum of its proper divisors (24929749).

666049931 is a wasteful number, since it uses less digits than its factorization.

666049931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65445.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 666049931 is about 25807.9431764719. The cubic root of 666049931 is about 873.3109975090.

The spelling of 666049931 in words is "six hundred sixty-six million, forty-nine thousand, nine hundred thirty-one".