1664044342256 has 20 divisors (see below), whose sum is σ = 3225435541800. Its totient is φ = 831673879872.

The previous prime is 1664044342217. The next prime is 1664044342291. The reversal of 1664044342256 is 6522434404661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664044342256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21728786 + ... + 21805233.

It is an arithmetic number, because the mean of its divisors is an integer number (161271777090).

Almost surely, 2^{1664044342256} is an apocalyptic number.

1664044342256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1664044342256 is a deficient number, since it is larger than the sum of its proper divisors (1561391199544).

1664044342256 is a wasteful number, since it uses less digits than its factorization.

1664044342256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43536416 (or 43536410 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 47.

The spelling of 1664044342256 in words is "one trillion, six hundred sixty-four billion, forty-four million, three hundred forty-two thousand, two hundred fifty-six".