646516450 has 24 divisors (see below), whose sum is σ = 1203994368. Its totient is φ = 258289680.

The previous prime is 646516417. The next prime is 646516469. The reversal of 646516450 is 54615646.

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 11 ways as a sum of consecutive naturals, for example, 35659 + ... + 50641.

It is an arithmetic number, because the mean of its divisors is an integer number (50166432).

Almost surely, 2^646516450 is an apocalyptic number.

646516450 is a deficient number, since it is larger than the sum of its proper divisors (557477918).

646516450 is a wasteful number, since it uses less digits than its factorization.

646516450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15858 (or 15853 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 646516450 is about 25426.6877512585. The cubic root of 646516450 is about 864.6888519720.

The spelling of 646516450 in words is "six hundred forty-six million, five hundred sixteen thousand, four hundred fifty".