646394455 has 16 divisors (see below), whose sum is σ = 897168384. Its totient is φ = 437899680.

The previous prime is 646394449. The next prime is 646394467. The reversal of 646394455 is 554493646.

646394455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646394455 - 2⁷ = 646394327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108351 + ... + 114160.

It is an arithmetic number, because the mean of its divisors is an integer number (56073024).

Almost surely, 2^646394455 is an apocalyptic number.

646394455 is a deficient number, since it is larger than the sum of its proper divisors (250773929).

646394455 is a wasteful number, since it uses less digits than its factorization.

646394455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222606.

The product of its digits is 1555200, while the sum is 46.

The square root of 646394455 is about 25424.2886822818. The cubic root of 646394455 is about 864.6344608051.

The spelling of 646394455 in words is "six hundred forty-six million, three hundred ninety-four thousand, four hundred fifty-five".