646066244 has 12 divisors (see below), whose sum is σ = 1138869564. Its totient is φ = 320674944.

The previous prime is 646066229. The next prime is 646066247. The reversal of 646066244 is 442660646.

It can be written as a sum of positive squares in 2 ways, for example, as 129049600 + 517016644 = 11360^2 + 22738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 646066198 and 646066207.

It is not an unprimeable number, because it can be changed into a prime (646066247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588929 + ... + 590024.

It is an arithmetic number, because the mean of its divisors is an integer number (94905797).

Almost surely, 2^646066244 is an apocalyptic number.

It is an amenable number.

646066244 is a deficient number, since it is larger than the sum of its proper divisors (492803320).

646066244 is a wasteful number, since it uses less digits than its factorization.

646066244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179094 (or 1179092 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 646066244 is about 25417.8331885312. The cubic root of 646066244 is about 864.4880947675.

The spelling of 646066244 in words is "six hundred forty-six million, sixty-six thousand, two hundred forty-four".