646222646 has 16 divisors (see below), whose sum is σ = 995011776. Its totient is φ = 314622336.

The previous prime is 646222637. The next prime is 646222669.

It is a happy number.

646222646 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1070 + ... + 35966.

It is an arithmetic number, because the mean of its divisors is an integer number (62188236).

Almost surely, 2^646222646 is an apocalyptic number.

646222646 is a deficient number, since it is larger than the sum of its proper divisors (348789130).

646222646 is a wasteful number, since it uses less digits than its factorization.

646222646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35143.

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

The square root of 646222646 is about 25420.9096218054. The cubic root of 646222646 is about 864.5578485836.

The spelling of 646222646 in words is "six hundred forty-six million, two hundred twenty-two thousand, six hundred forty-six".