646664054 has 16 divisors (see below), whose sum is σ = 1052107056. Its totient is φ = 296889600.

The previous prime is 646664047. The next prime is 646664087. The reversal of 646664054 is 450466646.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230552 + ... + 233339.

It is an arithmetic number, because the mean of its divisors is an integer number (65756691).

Almost surely, 2^646664054 is an apocalyptic number.

646664054 is a deficient number, since it is larger than the sum of its proper divisors (405443002).

646664054 is a wasteful number, since it uses less digits than its factorization.

646664054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463951.

The product of its (nonzero) digits is 414720, while the sum is 41.

The square root of 646664054 is about 25429.5901264649. The cubic root of 646664054 is about 864.7546517009.

The spelling of 646664054 in words is "six hundred forty-six million, six hundred sixty-four thousand, fifty-four".