646843016 has 8 divisors (see below), whose sum is σ = 1212830670. Its totient is φ = 323421504.

The previous prime is 646843003. The next prime is 646843051. The reversal of 646843016 is 610348646.

It can be written as a sum of positive squares in only one way, i.e., 565012900 + 81830116 = 23770^2 + 9046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40427681 + ... + 40427696.

Almost surely, 2^646843016 is an apocalyptic number.

It is an amenable number.

646843016 is a deficient number, since it is larger than the sum of its proper divisors (565987654).

646843016 is a wasteful number, since it uses less digits than its factorization.

646843016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80855383 (or 80855379 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 646843016 is about 25433.1086578106. The cubic root of 646843016 is about 864.8344169448.

The spelling of 646843016 in words is "six hundred forty-six million, eight hundred forty-three thousand, sixteen".