646606366 has 16 divisors (see below), whose sum is σ = 1166808960. Its totient is φ = 262531800.

The previous prime is 646606361. The next prime is 646606369. The reversal of 646606366 is 663606646.

646606366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646606361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1215160 + ... + 1215691.

It is an arithmetic number, because the mean of its divisors is an integer number (72925560).

Almost surely, 2^646606366 is an apocalyptic number.

646606366 is a deficient number, since it is larger than the sum of its proper divisors (520202594).

646606366 is a wasteful number, since it uses less digits than its factorization.

646606366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430879.

The product of its (nonzero) digits is 559872, while the sum is 43.

The square root of 646606366 is about 25428.4558320005. The cubic root of 646606366 is about 864.7289364167.

The spelling of 646606366 in words is "six hundred forty-six million, six hundred six thousand, three hundred sixty-six".