120011661 has 24 divisors (see below), whose sum is σ = 216126144. Its totient is φ = 62343360.

The previous prime is 120011659. The next prime is 120011719. The reversal of 120011661 is 166110021.

120011661 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 1 + 1 + 661 = 666.

It is not a de Polignac number, because 120011661 - 2¹ = 120011659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120011611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85896 + ... + 87281.

It is an arithmetic number, because the mean of its divisors is an integer number (9005256).

Almost surely, 2^120011661 is an apocalyptic number.

120011661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120011661 is a deficient number, since it is larger than the sum of its proper divisors (96114483).

120011661 is a wasteful number, since it uses less digits than its factorization.

120011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173201 (or 173198 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 120011661 is about 10954.9833865689. The cubic root of 120011661 is about 493.2583912925.

Adding to 120011661 its reverse (166110021), we get a palindrome (286121682).

The spelling of 120011661 in words is "one hundred twenty million, eleven thousand, six hundred sixty-one".