120155665 has 32 divisors (see below), whose sum is σ = 168989184. Its totient is φ = 80317440.

The previous prime is 120155663. The next prime is 120155741. The reversal of 120155665 is 566551021.

It is not a de Polignac number, because 120155665 - 2¹ = 120155663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120155663) 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 31 ways as a sum of consecutive naturals, for example, 356377 + ... + 356713.

It is an arithmetic number, because the mean of its divisors is an integer number (5280912).

Almost surely, 2^120155665 is an apocalyptic number.

It is an amenable number.

120155665 is a deficient number, since it is larger than the sum of its proper divisors (48833519).

120155665 is a wasteful number, since it uses less digits than its factorization.

120155665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 120155665 is about 10961.5539500565. The cubic root of 120155665 is about 493.4556021002.

The spelling of 120155665 in words is "one hundred twenty million, one hundred fifty-five thousand, six hundred sixty-five".