664784840863 has 24 divisors (see below), whose sum is σ = 829649988720. Its totient is φ = 525045995520.

The previous prime is 664784840861. The next prime is 664784840873. The reversal of 664784840863 is 368048487466.

It is not a de Polignac number, because 664784840863 - 2¹ = 664784840861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664784840795 and 664784840804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664784840861) 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, 8001658 + ... + 8084311.

It is an arithmetic number, because the mean of its divisors is an integer number (34568749530).

Almost surely, 2^664784840863 is an apocalyptic number.

664784840863 is a deficient number, since it is larger than the sum of its proper divisors (164865147857).

664784840863 is a wasteful number, since it uses less digits than its factorization.

664784840863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16086027 (or 16086010 counting only the distinct ones).

The product of its (nonzero) digits is 148635648, while the sum is 64.

The spelling of 664784840863 in words is "six hundred sixty-four billion, seven hundred eighty-four million, eight hundred forty thousand, eight hundred sixty-three".