205078913135 has 4 divisors (see below), whose sum is σ = 246094695768. Its totient is φ = 164063130504.

The previous prime is 205078913129. The next prime is 205078913191. The reversal of 205078913135 is 531319870502.

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

It is a cyclic number.

It is not a de Polignac number, because 205078913135 - 2⁶ = 205078913071 is a prime.

It is a super-2 number, since 2×205078913135² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20507891309 + ... + 20507891318.

It is an arithmetic number, because the mean of its divisors is an integer number (61523673942).

Almost surely, 2^205078913135 is an apocalyptic number.

205078913135 is a deficient number, since it is larger than the sum of its proper divisors (41015782633).

205078913135 is an equidigital number, since it uses as much as digits as its factorization.

205078913135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41015782632.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 205078913135 in words is "two hundred five billion, seventy-eight million, nine hundred thirteen thousand, one hundred thirty-five".