12663221645 has 16 divisors (see below), whose sum is σ = 15382120320. Its totient is φ = 10007160000.

The previous prime is 12663221633. The next prime is 12663221657. The reversal of 12663221645 is 54612236621.

It is an interprime number because it is at equal distance from previous prime (12663221633) and next prime (12663221657).

It is not a de Polignac number, because 12663221645 - 2¹⁶ = 12663156109 is a prime.

It is a super-3 number, since 3×12663221645³ (a number of 31 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12663221599 and 12663221608.

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 15 ways as a sum of consecutive naturals, for example, 88295 + ... + 181995.

It is an arithmetic number, because the mean of its divisors is an integer number (961382520).

Almost surely, 2^12663221645 is an apocalyptic number.

It is an amenable number.

12663221645 is a deficient number, since it is larger than the sum of its proper divisors (2718898675).

12663221645 is a wasteful number, since it uses less digits than its factorization.

12663221645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94036.

The product of its digits is 103680, while the sum is 38.

The spelling of 12663221645 in words is "twelve billion, six hundred sixty-three million, two hundred twenty-one thousand, six hundred forty-five".