205715172216126 has 8 divisors (see below), whose sum is σ = 411430344432264. Its totient is φ = 68571724072040.

The previous prime is 205715172216109. The next prime is 205715172216139. The reversal of 205715172216126 is 621612271517502.

It is a sphenic number, since it is the product of 3 distinct primes.

205715172216126 is an admirable 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, 17142931018005 + ... + 17142931018016.

It is an arithmetic number, because the mean of its divisors is an integer number (51428793054033).

Almost surely, 2^{205715172216126} is an apocalyptic number.

205715172216126 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205715172216126 is a wasteful number, since it uses less digits than its factorization.

205715172216126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34285862036026.

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 205715172216126 in words is "two hundred five trillion, seven hundred fifteen billion, one hundred seventy-two million, two hundred sixteen thousand, one hundred twenty-six".