646456655 has 16 divisors (see below), whose sum is σ = 843094560. Its totient is φ = 472998528.

The previous prime is 646456639. The next prime is 646456663. The reversal of 646456655 is 556654646.

It is a cyclic number.

It is not a de Polignac number, because 646456655 - 2⁴ = 646456639 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 38537 + ... + 52706.

It is an arithmetic number, because the mean of its divisors is an integer number (52693410).

Almost surely, 2^646456655 is an apocalyptic number.

646456655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

646456655 is a deficient number, since it is larger than the sum of its proper divisors (196637905).

646456655 is a wasteful number, since it uses less digits than its factorization.

646456655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91370.

The product of its digits is 2592000, while the sum is 47.

The square root of 646456655 is about 25425.5118925854. The cubic root of 646456655 is about 864.6621933752.

The spelling of 646456655 in words is "six hundred forty-six million, four hundred fifty-six thousand, six hundred fifty-five".