646366385 has 16 divisors (see below), whose sum is σ = 891351552. Its totient is φ = 440769600.

The previous prime is 646366351. The next prime is 646366393. The reversal of 646366385 is 583663646.

It is not a de Polignac number, because 646366385 - 2¹² = 646362289 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 44681 + ... + 57350.

It is an arithmetic number, because the mean of its divisors is an integer number (55709472).

Almost surely, 2^646366385 is an apocalyptic number.

It is an amenable number.

646366385 is a deficient number, since it is larger than the sum of its proper divisors (244985167).

646366385 is a wasteful number, since it uses less digits than its factorization.

646366385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102224.

The product of its digits is 1866240, while the sum is 47.

The square root of 646366385 is about 25423.7366451118. The cubic root of 646366385 is about 864.6219448971.

The spelling of 646366385 in words is "six hundred forty-six million, three hundred sixty-six thousand, three hundred eighty-five".