120806370661 has 2 divisors, whose sum is σ = 120806370662. Its totient is φ = 120806370660.

The previous prime is 120806370571. The next prime is 120806370667. The reversal of 120806370661 is 166073608021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120804209761 + 2160900 = 347569^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 120806370661 - 2²⁷ = 120672152933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120806370667) by changing a digit.

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 as a sum of consecutive naturals, namely, 60403185330 + 60403185331.

It is an arithmetic number, because the mean of its divisors is an integer number (60403185331).

Almost surely, 2^120806370661 is an apocalyptic number.

It is an amenable number.

120806370661 is a deficient number, since it is larger than the sum of its proper divisors (1).

120806370661 is an equidigital number, since it uses as much as digits as its factorization.

120806370661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

Adding to 120806370661 its reverse (166073608021), we get a palindrome (286879978682).

The spelling of 120806370661 in words is "one hundred twenty billion, eight hundred six million, three hundred seventy thousand, six hundred sixty-one".