120112215661 has 2 divisors, whose sum is σ = 120112215662. Its totient is φ = 120112215660.

The previous prime is 120112215649. The next prime is 120112215683. The reversal of 120112215661 is 166512211021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115128561636 + 4983654025 = 339306^2 + 70595^2 .

It is a cyclic number.

It is not a de Polignac number, because 120112215661 - 2⁷ = 120112215533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120112215161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60056107830 + 60056107831.

It is an arithmetic number, because the mean of its divisors is an integer number (60056107831).

Almost surely, 2^120112215661 is an apocalyptic number.

It is an amenable number.

120112215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120112215661 is an equidigital number, since it uses as much as digits as its factorization.

120112215661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 120112215661 its reverse (166512211021), we get a palindrome (286624426682).

The spelling of 120112215661 in words is "one hundred twenty billion, one hundred twelve million, two hundred fifteen thousand, six hundred sixty-one".