1663223665121 has 16 divisors (see below), whose sum is σ = 1681992152064. Its totient is φ = 1644517655424.

The previous prime is 1663223665097. The next prime is 1663223665127. The reversal of 1663223665121 is 1215663223661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663223665121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1663223665127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161425856 + ... + 161436158.

It is an arithmetic number, because the mean of its divisors is an integer number (105124509504).

Almost surely, 2^{1663223665121} is an apocalyptic number.

It is an amenable number.

1663223665121 is a deficient number, since it is larger than the sum of its proper divisors (18768486943).

1663223665121 is a wasteful number, since it uses less digits than its factorization.

1663223665121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13160.

The product of its digits is 466560, while the sum is 44.

Adding to 1663223665121 its reverse (1215663223661), we get a palindrome (2878886888782).

The spelling of 1663223665121 in words is "one trillion, six hundred sixty-three billion, two hundred twenty-three million, six hundred sixty-five thousand, one hundred twenty-one".