205109379829078 has 12 divisors (see below), whose sum is σ = 308203830593820. Its totient is φ = 102375084177660.

The previous prime is 205109379829073. The next prime is 205109379829093. The reversal of 205109379829078 is 870928973901502.

It is a junction number, because it is equal to n+sod(n) for n = 205109379828998 and 205109379829016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205109379829073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156620608 + ... + 157924771.

It is an arithmetic number, because the mean of its divisors is an integer number (25683652549485).

Almost surely, 2^{205109379829078} is an apocalyptic number.

205109379829078 is a deficient number, since it is larger than the sum of its proper divisors (103094450764742).

205109379829078 is an frugal number, since it uses more digits than its factorization.

205109379829078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314546523 (or 314545952 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 70.

The spelling of 205109379829078 in words is "two hundred five trillion, one hundred nine billion, three hundred seventy-nine million, eight hundred twenty-nine thousand, seventy-eight".