205100155023 has 16 divisors (see below), whose sum is σ = 285029062656. Its totient is φ = 131037988320.

The previous prime is 205100155009. The next prime is 205100155033. The reversal of 205100155023 is 320551001502.

It is a happy number.

It is not a de Polignac number, because 205100155023 - 2¹³ = 205100146831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205100154984 and 205100155002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205100155033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10696140 + ... + 10715297.

It is an arithmetic number, because the mean of its divisors is an integer number (17814316416).

Almost surely, 2^205100155023 is an apocalyptic number.

205100155023 is a deficient number, since it is larger than the sum of its proper divisors (79928907633).

205100155023 is a wasteful number, since it uses less digits than its factorization.

205100155023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21411574.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 205100155023 its reverse (320551001502), we get a palindrome (525651156525).

The spelling of 205100155023 in words is "two hundred five billion, one hundred million, one hundred fifty-five thousand, twenty-three".