664824520437 has 32 divisors (see below), whose sum is σ = 1130864317440. Its totient is φ = 337331675520.

The previous prime is 664824520391. The next prime is 664824520457. The reversal of 664824520437 is 734025428466.

It is not a de Polignac number, because 664824520437 - 2²⁸ = 664556084981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664824520437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664824520457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33455512 + ... + 33475377.

It is an arithmetic number, because the mean of its divisors is an integer number (35339509920).

Almost surely, 2^664824520437 is an apocalyptic number.

It is an amenable number.

664824520437 is a deficient number, since it is larger than the sum of its proper divisors (466039797003).

664824520437 is a wasteful number, since it uses less digits than its factorization.

664824520437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66930953.

The product of its (nonzero) digits is 7741440, while the sum is 51.

The spelling of 664824520437 in words is "six hundred sixty-four billion, eight hundred twenty-four million, five hundred twenty thousand, four hundred thirty-seven".