120240555155 has 16 divisors (see below), whose sum is σ = 165822577920. Its totient is φ = 81990043872.

The previous prime is 120240555143. The next prime is 120240555157. The reversal of 120240555155 is 551555042021.

It is a cyclic number.

It is not a de Polignac number, because 120240555155 - 2⁶ = 120240555091 is a prime.

It is a super-3 number, since 3×120240555155³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (120240555157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9589949 + ... + 9602478.

It is an arithmetic number, because the mean of its divisors is an integer number (10363911120).

Almost surely, 2^120240555155 is an apocalyptic number.

120240555155 is a deficient number, since it is larger than the sum of its proper divisors (45582022765).

120240555155 is a wasteful number, since it uses less digits than its factorization.

120240555155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19192618.

The product of its (nonzero) digits is 50000, while the sum is 35.

Adding to 120240555155 its reverse (551555042021), we get a palindrome (671795597176).

The spelling of 120240555155 in words is "one hundred twenty billion, two hundred forty million, five hundred fifty-five thousand, one hundred fifty-five".