666746450 has 48 divisors (see below), whose sum is σ = 1293131520. Its totient is φ = 255480000.

The previous prime is 666746407. The next prime is 666746459. The reversal of 666746450 is 54647666.

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 23 ways as a sum of consecutive naturals, for example, 154421 + ... + 158679.

It is an arithmetic number, because the mean of its divisors is an integer number (26940240).

Almost surely, 2^666746450 is an apocalyptic number.

666746450 is a deficient number, since it is larger than the sum of its proper divisors (626385070).

666746450 is a wasteful number, since it uses less digits than its factorization.

666746450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403 (or 4398 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 666746450 is about 25821.4339261010. The cubic root of 666746450 is about 873.6153119269.

The spelling of 666746450 in words is "six hundred sixty-six million, seven hundred forty-six thousand, four hundred fifty".