1223651599661 has 2 divisors, whose sum is σ = 1223651599662. Its totient is φ = 1223651599660.

The previous prime is 1223651599633. The next prime is 1223651599669. The reversal of 1223651599661 is 1669951563221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069764078436 + 153887521225 = 1034294^2 + 392285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223651599661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223651599597 and 1223651599606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223651599669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611825799830 + 611825799831.

It is an arithmetic number, because the mean of its divisors is an integer number (611825799831).

Almost surely, 2^{1223651599661} is an apocalyptic number.

It is an amenable number.

1223651599661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223651599661 is an equidigital number, since it uses as much as digits as its factorization.

1223651599661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 56.

The spelling of 1223651599661 in words is "one trillion, two hundred twenty-three billion, six hundred fifty-one million, five hundred ninety-nine thousand, six hundred sixty-one".