666489744 has 30 divisors (see below), whose sum is σ = 1865246006. Its totient is φ = 222163200.

The previous prime is 666489673. The next prime is 666489773. The reversal of 666489744 is 447984666.

It can be written as a sum of positive squares in only one way, i.e., 666259344 + 230400 = 25812^2 + 480^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2314057 + ... + 2314344.

Almost surely, 2^666489744 is an apocalyptic number.

It is an amenable number.

666489744 is an abundant number, since it is smaller than the sum of its proper divisors (1198756262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666489744 is a wasteful number, since it uses less digits than its factorization.

666489744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4628415 (or 4628406 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 666489744 is about 25816.4626546706. The cubic root of 666489744 is about 873.5031798065.

The spelling of 666489744 in words is "six hundred sixty-six million, four hundred eighty-nine thousand, seven hundred forty-four".