11451661221233 has 2 divisors, whose sum is σ = 11451661221234. Its totient is φ = 11451661221232.

The previous prime is 11451661221211. The next prime is 11451661221263. The reversal of 11451661221233 is 33212216615411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5924516645089 + 5527144576144 = 2434033^2 + 2350988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11451661221233 is a prime.

It is a super-2 number, since 2×11451661221233² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11451661221263) by changing a digit.

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 as a sum of consecutive naturals, namely, 5725830610616 + 5725830610617.

It is an arithmetic number, because the mean of its divisors is an integer number (5725830610617).

Almost surely, 2^{11451661221233} is an apocalyptic number.

It is an amenable number.

11451661221233 is a deficient number, since it is larger than the sum of its proper divisors (1).

11451661221233 is an equidigital number, since it uses as much as digits as its factorization.

11451661221233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

Adding to 11451661221233 its reverse (33212216615411), we get a palindrome (44663877836644).

The spelling of 11451661221233 in words is "eleven trillion, four hundred fifty-one billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred thirty-three".