664251205 has 16 divisors (see below), whose sum is σ = 814924800. Its totient is φ = 519615040.

The previous prime is 664251193. The next prime is 664251227. The reversal of 664251205 is 502152466.

It is not a de Polignac number, because 664251205 - 2⁹ = 664250693 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50451 + ... + 62239.

It is an arithmetic number, because the mean of its divisors is an integer number (50932800).

Almost surely, 2^664251205 is an apocalyptic number.

It is an amenable number.

664251205 is a deficient number, since it is larger than the sum of its proper divisors (150673595).

664251205 is a wasteful number, since it uses less digits than its factorization.

664251205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12044.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 664251205 is about 25773.0713148433. The cubic root of 664251205 is about 872.5241378861.

The spelling of 664251205 in words is "six hundred sixty-four million, two hundred fifty-one thousand, two hundred five".