666633744 has 60 divisors (see below), whose sum is σ = 2132173056. Its totient is φ = 190466496.

The previous prime is 666633731. The next prime is 666633749. The reversal of 666633744 is 447336666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 666633744.

It is not an unprimeable number, because it can be changed into a prime (666633749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329664 + ... + 331679.

Almost surely, 2^666633744 is an apocalyptic number.

It is an amenable number.

666633744 is an abundant number, since it is smaller than the sum of its proper divisors (1465539312).

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

666633744 is a wasteful number, since it uses less digits than its factorization.

666633744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661364 (or 661355 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 45.

The square root of 666633744 is about 25819.2514221462. The cubic root of 666633744 is about 873.5660842003.

It can be divided in two parts, 66663 and 3744, that added together give a palindrome (70407).

The spelling of 666633744 in words is "six hundred sixty-six million, six hundred thirty-three thousand, seven hundred forty-four".