664650443 has 4 divisors (see below), whose sum is σ = 664771008. Its totient is φ = 664529880.

The previous prime is 664650439. The next prime is 664650491. The reversal of 664650443 is 344056466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664650443 - 2² = 664650439 is a prime.

It is a super-2 number, since 2×664650443² = 883520422760192498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664650397 and 664650406.

It is not an unprimeable number, because it can be changed into a prime (664650433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51596 + ... + 63177.

It is an arithmetic number, because the mean of its divisors is an integer number (166192752).

Almost surely, 2^664650443 is an apocalyptic number.

664650443 is a deficient number, since it is larger than the sum of its proper divisors (120565).

664650443 is a wasteful number, since it uses less digits than its factorization.

664650443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120564.

The product of its (nonzero) digits is 207360, while the sum is 38.

The square root of 664650443 is about 25780.8154060340. The cubic root of 664650443 is about 872.6989086271.

The spelling of 664650443 in words is "six hundred sixty-four million, six hundred fifty thousand, four hundred forty-three".