205421066063250 has 128 divisors (see below), whose sum is σ = 516223154723328. Its totient is φ = 54406775808000.

The previous prime is 205421066063237. The next prime is 205421066063293. The reversal of 205421066063250 is 52360660124502.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 88160715 + ... + 90460785.

It is an arithmetic number, because the mean of its divisors is an integer number (4032993396276).

Almost surely, 2^{205421066063250} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205421066063250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258111577361664).

205421066063250 is an abundant number, since it is smaller than the sum of its proper divisors (310802088660078).

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

205421066063250 is a wasteful number, since it uses less digits than its factorization.

205421066063250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300901 (or 2300891 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 205421066063250 in words is "two hundred five trillion, four hundred twenty-one billion, sixty-six million, sixty-three thousand, two hundred fifty".