664423596536 has 32 divisors (see below), whose sum is σ = 1424202380640. Its totient is φ = 284665463808.

The previous prime is 664423596523. The next prime is 664423596547. The reversal of 664423596536 is 635695324466.

It is a happy number.

It is a super-2 number, since 2×664423596536² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639025 + ... + 2003808.

It is an arithmetic number, because the mean of its divisors is an integer number (44506324395).

Almost surely, 2^664423596536 is an apocalyptic number.

It is an amenable number.

664423596536 is an abundant number, since it is smaller than the sum of its proper divisors (759778784104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664423596536 is a wasteful number, since it uses less digits than its factorization.

664423596536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646103 (or 3646099 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 59.

The spelling of 664423596536 in words is "six hundred sixty-four billion, four hundred twenty-three million, five hundred ninety-six thousand, five hundred thirty-six".