666461788 has 12 divisors (see below), whose sum is σ = 1166598160. Its totient is φ = 333148032.

The previous prime is 666461779. The next prime is 666461801. The reversal of 666461788 is 887164666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408 + ... + 36511.

Almost surely, 2^666461788 is an apocalyptic number.

It is an amenable number.

666461788 is a deficient number, since it is larger than the sum of its proper divisors (500136372).

666461788 is a wasteful number, since it uses less digits than its factorization.

666461788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41436 (or 41434 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 666461788 is about 25815.9212115315. The cubic root of 666461788 is about 873.4909665671.

The spelling of 666461788 in words is "six hundred sixty-six million, four hundred sixty-one thousand, seven hundred eighty-eight".