666435824 has 10 divisors (see below), whose sum is σ = 1291219440. Its totient is φ = 333217904.

The previous prime is 666435821. The next prime is 666435829. The reversal of 666435824 is 428534666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666435821) 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 as a sum of consecutive naturals, namely, 20826104 + ... + 20826135.

It is an arithmetic number, because the mean of its divisors is an integer number (129121944).

Almost surely, 2^666435824 is an apocalyptic number.

It is an amenable number.

666435824 is a deficient number, since it is larger than the sum of its proper divisors (624783616).

666435824 is a wasteful number, since it uses less digits than its factorization.

666435824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41652247 (or 41652241 counting only the distinct ones).

The product of its digits is 829440, while the sum is 44.

The square root of 666435824 is about 25815.4183386596. The cubic root of 666435824 is about 873.4796232741.

The spelling of 666435824 in words is "six hundred sixty-six million, four hundred thirty-five thousand, eight hundred twenty-four".