155220588242 has 4 divisors (see below), whose sum is σ = 232830882366. Its totient is φ = 77610294120.

The previous prime is 155220588209. The next prime is 155220588251. The reversal of 155220588242 is 242885022551.

It is a happy number.

155220588242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 148749833761 + 6470754481 = 385681^2 + 80441^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155220588193 and 155220588202.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38805147059 + ... + 38805147062.

Almost surely, 2^155220588242 is an apocalyptic number.

155220588242 is a deficient number, since it is larger than the sum of its proper divisors (77610294124).

155220588242 is an equidigital number, since it uses as much as digits as its factorization.

155220588242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77610294123.

The product of its (nonzero) digits is 512000, while the sum is 44.

The spelling of 155220588242 in words is "one hundred fifty-five billion, two hundred twenty million, five hundred eighty-eight thousand, two hundred forty-two".