666746449 has 8 divisors (see below), whose sum is σ = 678394112. Its totient is φ = 655166880.

The previous prime is 666746407. The next prime is 666746459. The reversal of 666746449 is 944647666.

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 666746449 - 2¹³ = 666738257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666746396 and 666746405.

It is not an unprimeable number, because it can be changed into a prime (666746459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2932 + ... + 36634.

It is an arithmetic number, because the mean of its divisors is an integer number (84799264).

Almost surely, 2^666746449 is an apocalyptic number.

It is an amenable number.

666746449 is a deficient number, since it is larger than the sum of its proper divisors (11647663).

666746449 is a wasteful number, since it uses less digits than its factorization.

666746449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34047.

The product of its digits is 5225472, while the sum is 52.

The square root of 666746449 is about 25821.4339067372. The cubic root of 666746449 is about 873.6153114902.

The spelling of 666746449 in words is "six hundred sixty-six million, seven hundred forty-six thousand, four hundred forty-nine".