646643105 has 16 divisors (see below), whose sum is σ = 801944064. Its totient is φ = 500039040.

The previous prime is 646643099. The next prime is 646643141. The reversal of 646643105 is 501346646.

It is not a de Polignac number, because 646643105 - 2⁸ = 646642849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168134 + ... + 171936.

It is an arithmetic number, because the mean of its divisors is an integer number (50121504).

Almost surely, 2^646643105 is an apocalyptic number.

It is an amenable number.

646643105 is a deficient number, since it is larger than the sum of its proper divisors (155300959).

646643105 is a wasteful number, since it uses less digits than its factorization.

646643105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 646643105 is about 25429.1782210908. The cubic root of 646643105 is about 864.7453135493.

The spelling of 646643105 in words is "six hundred forty-six million, six hundred forty-three thousand, one hundred five".