205242043155 has 32 divisors (see below), whose sum is σ = 330417854208. Its totient is φ = 108787056000.

The previous prime is 205242043141. The next prime is 205242043163. The reversal of 205242043155 is 551340242502.

It is a happy number.

It is not a de Polignac number, because 205242043155 - 2²⁷ = 205107825427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2172412 + ... + 2264918.

It is an arithmetic number, because the mean of its divisors is an integer number (10325557944).

Almost surely, 2^205242043155 is an apocalyptic number.

205242043155 is a deficient number, since it is larger than the sum of its proper divisors (125175811053).

205242043155 is a wasteful number, since it uses less digits than its factorization.

205242043155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93427.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 205242043155 its reverse (551340242502), we get a palindrome (756582285657).

The spelling of 205242043155 in words is "two hundred five billion, two hundred forty-two million, forty-three thousand, one hundred fifty-five".