666965049 has 4 divisors (see below), whose sum is σ = 889286736. Its totient is φ = 444643364.

The previous prime is 666965041. The next prime is 666965053. The reversal of 666965049 is 940569666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666965049 - 2³ = 666965041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666964992 and 666965010.

It is not an unprimeable number, because it can be changed into a prime (666965041) by changing a digit.

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, 111160839 + ... + 111160844.

It is an arithmetic number, because the mean of its divisors is an integer number (222321684).

Almost surely, 2^666965049 is an apocalyptic number.

It is an amenable number.

666965049 is a deficient number, since it is larger than the sum of its proper divisors (222321687).

666965049 is a wasteful number, since it uses less digits than its factorization.

666965049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222321686.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 666965049 is about 25825.6664773632. Note that the first 3 decimals coincide. The cubic root of 666965049 is about 873.7107757857.

The spelling of 666965049 in words is "six hundred sixty-six million, nine hundred sixty-five thousand, forty-nine".