1663602335645 has 8 divisors (see below), whose sum is σ = 1996416474840. Its totient is φ = 1330819420480.

The previous prime is 1663602335609. The next prime is 1663602335729. The reversal of 1663602335645 is 5465332063661.

It can be written as a sum of positive squares in 4 ways, for example, as 151622235769 + 1511980099876 = 389387^2 + 1229626^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1663602335645 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1663602335593 and 1663602335602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7688630 + ... + 7902039.

It is an arithmetic number, because the mean of its divisors is an integer number (249552059355).

Almost surely, 2^{1663602335645} is an apocalyptic number.

It is an amenable number.

1663602335645 is a deficient number, since it is larger than the sum of its proper divisors (332814139195).

1663602335645 is a wasteful number, since it uses less digits than its factorization.

1663602335645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15612015.

The product of its (nonzero) digits is 6998400, while the sum is 50.

The spelling of 1663602335645 in words is "one trillion, six hundred sixty-three billion, six hundred two million, three hundred thirty-five thousand, six hundred forty-five".