664399533 has 16 divisors (see below), whose sum is σ = 1045078016. Its totient is φ = 367409520.

The previous prime is 664399517. The next prime is 664399553. The reversal of 664399533 is 335993466.

It is a happy number.

It is not a de Polignac number, because 664399533 - 2⁴ = 664399517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664399553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509641 + ... + 510942.

It is an arithmetic number, because the mean of its divisors is an integer number (65317376).

Almost surely, 2^664399533 is an apocalyptic number.

It is an amenable number.

664399533 is a deficient number, since it is larger than the sum of its proper divisors (380678483).

664399533 is a wasteful number, since it uses less digits than its factorization.

664399533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020624.

The product of its digits is 1574640, while the sum is 48.

The square root of 664399533 is about 25775.9487313270. The cubic root of 664399533 is about 872.5890782417.

The spelling of 664399533 in words is "six hundred sixty-four million, three hundred ninety-nine thousand, five hundred thirty-three".