120660610561 has 8 divisors (see below), whose sum is σ = 127865745000. Its totient is φ = 113658437760.

The previous prime is 120660610537. The next prime is 120660610589. The reversal of 120660610561 is 165016066021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5625000000 + 115035610561 = 75000^2 + 339169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120660610561 - 2¹³ = 120660602369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120660610501) 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 in 7 ways as a sum of consecutive naturals, for example, 50739186 + ... + 50741563.

It is an arithmetic number, because the mean of its divisors is an integer number (15983218125).

Almost surely, 2^120660610561 is an apocalyptic number.

It is an amenable number.

120660610561 is a deficient number, since it is larger than the sum of its proper divisors (7205134439).

120660610561 is a wasteful number, since it uses less digits than its factorization.

120660610561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101480819.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 120660610561 its reverse (165016066021), we get a palindrome (285676676582).

The spelling of 120660610561 in words is "one hundred twenty billion, six hundred sixty million, six hundred ten thousand, five hundred sixty-one".