664985227191 has 16 divisors (see below), whose sum is σ = 915360307200. Its totient is φ = 428970310560.

The previous prime is 664985227189. The next prime is 664985227199. The reversal of 664985227191 is 191722589466.

It is not a de Polignac number, because 664985227191 - 2¹ = 664985227189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664985227199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335785 + ... + 1201133.

It is an arithmetic number, because the mean of its divisors is an integer number (57210019200).

Almost surely, 2^664985227191 is an apocalyptic number.

664985227191 is a deficient number, since it is larger than the sum of its proper divisors (250375080009).

664985227191 is a wasteful number, since it uses less digits than its factorization.

664985227191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873646.

The product of its digits is 13063680, while the sum is 60.

The spelling of 664985227191 in words is "six hundred sixty-four billion, nine hundred eighty-five million, two hundred twenty-seven thousand, one hundred ninety-one".