205151122642 has 16 divisors (see below), whose sum is σ = 308566154520. Its totient is φ = 102295821312.

The previous prime is 205151122639. The next prime is 205151122661. The reversal of 205151122642 is 246221151502.

It can be written as a sum of positive squares in 4 ways, for example, as 165550520641 + 39600602001 = 406879^2 + 198999^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 6108448 + ... + 6141940.

Almost surely, 2^205151122642 is an apocalyptic number.

205151122642 is a deficient number, since it is larger than the sum of its proper divisors (103415031878).

205151122642 is a wasteful number, since it uses less digits than its factorization.

205151122642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41757.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 205151122642 in words is "two hundred five billion, one hundred fifty-one million, one hundred twenty-two thousand, six hundred forty-two".