664425633 has 16 divisors (see below), whose sum is σ = 937088640. Its totient is φ = 417884544.

The previous prime is 664425607. The next prime is 664425661. The reversal of 664425633 is 336524466.

It is not a de Polignac number, because 664425633 - 2¹⁰ = 664424609 is a prime.

It is a super-3 number, since 3×664425633³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 664425591 and 664425600.

It is not an unprimeable number, because it can be changed into a prime (664425683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60918 + ... + 70991.

It is an arithmetic number, because the mean of its divisors is an integer number (58568040).

Almost surely, 2^664425633 is an apocalyptic number.

It is an amenable number.

664425633 is a deficient number, since it is larger than the sum of its proper divisors (272663007).

664425633 is a wasteful number, since it uses less digits than its factorization.

664425633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132008.

The product of its digits is 311040, while the sum is 39.

The square root of 664425633 is about 25776.4550122782. The cubic root of 664425633 is about 872.6005042364.

The spelling of 664425633 in words is "six hundred sixty-four million, four hundred twenty-five thousand, six hundred thirty-three".