205240015102013 has 4 divisors (see below), whose sum is σ = 205258685177148. Its totient is φ = 205221345026880.

The previous prime is 205240015101977. The next prime is 205240015102033. The reversal of 205240015102013 is 310201510042502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 138986226934564 + 66253788167449 = 11789242^2 + 8139643^2 .

It is a cyclic number.

It is not a de Polignac number, because 205240015102013 - 2⁶ = 205240015101949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205240015102033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9335021078 + ... + 9335043063.

It is an arithmetic number, because the mean of its divisors is an integer number (51314671294287).

Almost surely, 2^{205240015102013} is an apocalyptic number.

It is an amenable number.

205240015102013 is a deficient number, since it is larger than the sum of its proper divisors (18670075135).

205240015102013 is a wasteful number, since it uses less digits than its factorization.

205240015102013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18670075134.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 205240015102013 its reverse (310201510042502), we get a palindrome (515441525144515).

The spelling of 205240015102013 in words is "two hundred five trillion, two hundred forty billion, fifteen million, one hundred two thousand, thirteen".