205162840042 has 4 divisors (see below), whose sum is σ = 307744260066. Its totient is φ = 102581420020.

The previous prime is 205162840033. The next prime is 205162840073. The reversal of 205162840042 is 240048261502.

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., 203842317121 + 1320522921 = 451489^2 + 36339^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51290710009 + ... + 51290710012.

Almost surely, 2^205162840042 is an apocalyptic number.

205162840042 is a deficient number, since it is larger than the sum of its proper divisors (102581420024).

205162840042 is a wasteful number, since it uses less digits than its factorization.

205162840042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102581420023.

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 205162840042 in words is "two hundred five billion, one hundred sixty-two million, eight hundred forty thousand, forty-two".