664943133 has 32 divisors (see below), whose sum is σ = 976757760. Its totient is φ = 400498560.

The previous prime is 664943131. The next prime is 664943137. The reversal of 664943133 is 331349466.

664943133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664943133 - 2¹ = 664943131 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 664943091 and 664943100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664943131) 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, 643185 + ... + 644217.

It is an arithmetic number, because the mean of its divisors is an integer number (30523680).

Almost surely, 2^664943133 is an apocalyptic number.

It is an amenable number.

664943133 is a deficient number, since it is larger than the sum of its proper divisors (311814627).

664943133 is a wasteful number, since it uses less digits than its factorization.

664943133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569.

The product of its digits is 139968, while the sum is 39.

The square root of 664943133 is about 25786.4912890451. The cubic root of 664943133 is about 872.8269923745.

The spelling of 664943133 in words is "six hundred sixty-four million, nine hundred forty-three thousand, one hundred thirty-three".