664578684453 has 16 divisors (see below), whose sum is σ = 924694243200. Its totient is φ = 423760417344.

The previous prime is 664578684389. The next prime is 664578684463. The reversal of 664578684453 is 354486875466.

It is a happy number.

It is not a de Polignac number, because 664578684453 - 2⁶ = 664578684389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664578684463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715123 + ... + 1356671.

It is an arithmetic number, because the mean of its divisors is an integer number (57793390200).

Almost surely, 2^664578684453 is an apocalyptic number.

It is an amenable number.

664578684453 is a deficient number, since it is larger than the sum of its proper divisors (260115558747).

664578684453 is a wasteful number, since it uses less digits than its factorization.

664578684453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656588.

The product of its digits is 464486400, while the sum is 66.

The spelling of 664578684453 in words is "six hundred sixty-four billion, five hundred seventy-eight million, six hundred eighty-four thousand, four hundred fifty-three".