120206661 has 16 divisors (see below), whose sum is σ = 163614528. Its totient is φ = 78480000.

The previous prime is 120206651. The next prime is 120206701. The reversal of 120206661 is 166602021.

It is not a de Polignac number, because 120206661 - 2¹⁷ = 120075589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120206641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44625 + ... + 47241.

It is an arithmetic number, because the mean of its divisors is an integer number (10225908).

Almost surely, 2^120206661 is an apocalyptic number.

It is an amenable number.

120206661 is a deficient number, since it is larger than the sum of its proper divisors (43407867).

120206661 is a wasteful number, since it uses less digits than its factorization.

120206661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 120206661 is about 10963.8798333437. The cubic root of 120206661 is about 493.5254023955.

Adding to 120206661 its reverse (166602021), we get a palindrome (286808682).

It can be divided in two parts, 12020 and 6661, that added together give a palindrome (18681).

The spelling of 120206661 in words is "one hundred twenty million, two hundred six thousand, six hundred sixty-one".