664998449913 has 64 divisors (see below), whose sum is σ = 1167736768000. Its totient is φ = 373769303040.

The previous prime is 664998449903. The next prime is 664998449917. The reversal of 664998449913 is 319944899466.

664998449913 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 98 + 449 + 91 + 3 = 666.

It is not a de Polignac number, because 664998449913 - 2²⁵ = 664964895481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664998449917) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23656 + ... + 1153497.

It is an arithmetic number, because the mean of its divisors is an integer number (18245887000).

Almost surely, 2^664998449913 is an apocalyptic number.

664998449913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

664998449913 is a deficient number, since it is larger than the sum of its proper divisors (502738318087).

664998449913 is a wasteful number, since it uses less digits than its factorization.

664998449913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177244 (or 1177224 counting only the distinct ones).

The product of its digits is 362797056, while the sum is 72.

The spelling of 664998449913 in words is "six hundred sixty-four billion, nine hundred ninety-eight million, four hundred forty-nine thousand, nine hundred thirteen".