205065551000000 has 196 divisors, whose sum is σ = 508725226515000. Its totient is φ = 82014441600000.

The previous prime is 205065550999973. The next prime is 205065551000029. The reversal of 205065551000000 is 155560502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11298990926 + ... + 11299009074.

Almost surely, 2^{205065551000000} is an apocalyptic number.

205065551000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205065551000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254362613257500).

205065551000000 is an abundant number, since it is smaller than the sum of its proper divisors (303659675515000).

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

205065551000000 is an frugal number, since it uses more digits than its factorization.

205065551000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29490 (or 29455 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 205065551000000 in words is "two hundred five trillion, sixty-five billion, five hundred fifty-one million", and thus it is an aban number.