155220445240242 has 48 divisors (see below), whose sum is σ = 327418375464192. Its totient is φ = 49005768443040.

The previous prime is 155220445240241. The next prime is 155220445240261. The reversal of 155220445240242 is 242042544022551.

It is a junction number, because it is equal to n+sod(n) for n = 155220445240194 and 155220445240203.

It is not an unprimeable number, because it can be changed into a prime (155220445240241) 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 23 ways as a sum of consecutive naturals, for example, 188479693 + ... + 189301440.

It is an arithmetic number, because the mean of its divisors is an integer number (6821216155504).

Almost surely, 2^{155220445240242} is an apocalyptic number.

155220445240242 is an abundant number, since it is smaller than the sum of its proper divisors (172197930223950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155220445240242 is a wasteful number, since it uses less digits than its factorization.

155220445240242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377781263 (or 377781216 counting only the distinct ones).

The product of its (nonzero) digits is 1024000, while the sum is 42.

Adding to 155220445240242 its reverse (242042544022551), we get a palindrome (397262989262793).

The spelling of 155220445240242 in words is "one hundred fifty-five trillion, two hundred twenty billion, four hundred forty-five million, two hundred forty thousand, two hundred forty-two".