646255516 has 24 divisors (see below), whose sum is σ = 1144999856. Its totient is φ = 319127040.

The previous prime is 646255483. The next prime is 646255549. The reversal of 646255516 is 615552646.

It is an interprime number because it is at equal distance from previous prime (646255483) and next prime (646255549).

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, 220090 + ... + 223006.

Almost surely, 2^646255516 is an apocalyptic number.

It is an amenable number.

646255516 is a deficient number, since it is larger than the sum of its proper divisors (498744340).

646255516 is a wasteful number, since it uses less digits than its factorization.

646255516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589 (or 3587 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 646255516 is about 25421.5561286086. The cubic root of 646255516 is about 864.5725068622.

The spelling of 646255516 in words is "six hundred forty-six million, two hundred fifty-five thousand, five hundred sixteen".