664578840663 has 18 divisors (see below), whose sum is σ = 994190289144. Its totient is φ = 427774881072.

The previous prime is 664578840649. The next prime is 664578840683. The reversal of 664578840663 is 366048875466.

664578840663 is a `hidden beast` number, since 6 + 6 + 457 + 88 + 40 + 6 + 63 = 666.

It is not a de Polignac number, because 664578840663 - 2¹⁴ = 664578824279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664578840663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664578840613) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43893795 + ... + 43908932.

Almost surely, 2^664578840663 is an apocalyptic number.

664578840663 is a deficient number, since it is larger than the sum of its proper divisors (329611448481).

664578840663 is a wasteful number, since it uses less digits than its factorization.

664578840663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87802791 (or 87802759 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 63.

The spelling of 664578840663 in words is "six hundred sixty-four billion, five hundred seventy-eight million, eight hundred forty thousand, six hundred sixty-three".