664804125823 has 2 divisors, whose sum is σ = 664804125824. Its totient is φ = 664804125822.

The previous prime is 664804125787. The next prime is 664804125907. The reversal of 664804125823 is 328521408466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664804125823 - 2¹³ = 664804117631 is a prime.

It is a super-2 number, since 2×664804125823² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664804125023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332402062911 + 332402062912.

It is an arithmetic number, because the mean of its divisors is an integer number (332402062912).

Almost surely, 2^664804125823 is an apocalyptic number.

664804125823 is a deficient number, since it is larger than the sum of its proper divisors (1).

664804125823 is an equidigital number, since it uses as much as digits as its factorization.

664804125823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 664804125823 in words is "six hundred sixty-four billion, eight hundred four million, one hundred twenty-five thousand, eight hundred twenty-three".