664235546 has 16 divisors (see below), whose sum is σ = 1109997000. Its totient is φ = 295998528.

The previous prime is 664235531. The next prime is 664235587. The reversal of 664235546 is 645532466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 616777225 + 47458321 = 24835^2 + 6889^2 .

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 439721 + ... + 441228.

Almost surely, 2^664235546 is an apocalyptic number.

664235546 is a deficient number, since it is larger than the sum of its proper divisors (445761454).

664235546 is a wasteful number, since it uses less digits than its factorization.

664235546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880993.

The product of its digits is 518400, while the sum is 41.

The square root of 664235546 is about 25772.7675269848. The cubic root of 664235546 is about 872.5172815629.

The spelling of 664235546 in words is "six hundred sixty-four million, two hundred thirty-five thousand, five hundred forty-six".