2120173655 has 16 divisors (see below), whose sum is σ = 2555388000. Its totient is φ = 1688706048.

The previous prime is 2120173651. The next prime is 2120173703. The reversal of 2120173655 is 5563710212.

It is a cyclic number.

It is not a de Polignac number, because 2120173655 - 2² = 2120173651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120173651) 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 15 ways as a sum of consecutive naturals, for example, 1478819 + ... + 1480251.

It is an arithmetic number, because the mean of its divisors is an integer number (159711750).

Almost surely, 2^2120173655 is an apocalyptic number.

2120173655 is a deficient number, since it is larger than the sum of its proper divisors (435214345).

2120173655 is a wasteful number, since it uses less digits than its factorization.

2120173655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 2120173655 is about 46045.3434670652. The cubic root of 2120173655 is about 1284.6667326527. Note that the first 3 decimals are identical.

Adding to 2120173655 its reverse (5563710212), we get a palindrome (7683883867).

The spelling of 2120173655 in words is "two billion, one hundred twenty million, one hundred seventy-three thousand, six hundred fifty-five".