664478512423 has 24 divisors (see below), whose sum is σ = 787942172160. Its totient is φ = 555315841920.

The previous prime is 664478512421. The next prime is 664478512427. The reversal of 664478512423 is 324215874466.

It is not a de Polignac number, because 664478512423 - 2¹ = 664478512421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664478512421) 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, 2293783 + ... + 2567176.

It is an arithmetic number, because the mean of its divisors is an integer number (32830923840).

Almost surely, 2^664478512423 is an apocalyptic number.

664478512423 is a deficient number, since it is larger than the sum of its proper divisors (123463659737).

664478512423 is a wasteful number, since it uses less digits than its factorization.

664478512423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861047 (or 4861030 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 52.

The spelling of 664478512423 in words is "six hundred sixty-four billion, four hundred seventy-eight million, five hundred twelve thousand, four hundred twenty-three".