664681354173 has 24 divisors (see below), whose sum is σ = 1034129576480. Its totient is φ = 410035983840.

The previous prime is 664681354163. The next prime is 664681354187. The reversal of 664681354173 is 371453186466.

664681354173 is a `hidden beast` number, since 6 + 6 + 46 + 81 + 354 + 173 = 666.

It is not a de Polignac number, because 664681354173 - 2⁴ = 664681354157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664681354163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45190618 + ... + 45205323.

Almost surely, 2^664681354173 is an apocalyptic number.

It is an amenable number.

664681354173 is a deficient number, since it is larger than the sum of its proper divisors (369448222307).

664681354173 is a wasteful number, since it uses less digits than its factorization.

664681354173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90396009 (or 90396006 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 664681354173 in words is "six hundred sixty-four billion, six hundred eighty-one million, three hundred fifty-four thousand, one hundred seventy-three".