664428244408 has 16 divisors (see below), whose sum is σ = 1247448680280. Its totient is φ = 331775263008.

The previous prime is 664428244387. The next prime is 664428244421. The reversal of 664428244408 is 804442824466.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54850966 + ... + 54863077.

Almost surely, 2^664428244408 is an apocalyptic number.

It is an amenable number.

664428244408 is a deficient number, since it is larger than the sum of its proper divisors (583020435872).

664428244408 is a wasteful number, since it uses less digits than its factorization.

664428244408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109714806 (or 109714802 counting only the distinct ones).

The product of its (nonzero) digits is 9437184, while the sum is 52.

The spelling of 664428244408 in words is "six hundred sixty-four billion, four hundred twenty-eight million, two hundred forty-four thousand, four hundred eight".