661105224401 has 2 divisors, whose sum is σ = 661105224402. Its totient is φ = 661105224400.

The previous prime is 661105224397. The next prime is 661105224413. The reversal of 661105224401 is 104422501166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 436048915600 + 225056308801 = 660340^2 + 474401^2 .

It is a cyclic number.

It is not a de Polignac number, because 661105224401 - 2² = 661105224397 is a prime.

It is not a weakly prime, because it can be changed into another prime (661105224431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330552612200 + 330552612201.

It is an arithmetic number, because the mean of its divisors is an integer number (330552612201).

Almost surely, 2^661105224401 is an apocalyptic number.

It is an amenable number.

661105224401 is a deficient number, since it is larger than the sum of its proper divisors (1).

661105224401 is an equidigital number, since it uses as much as digits as its factorization.

661105224401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 661105224401 its reverse (104422501166), we get a palindrome (765527725567).

The spelling of 661105224401 in words is "six hundred sixty-one billion, one hundred five million, two hundred twenty-four thousand, four hundred one".