205420405143546 has 48 divisors (see below), whose sum is σ = 479246010048000. Its totient is φ = 63353318696064.

The previous prime is 205420405143439. The next prime is 205420405143571. The reversal of 205420405143546 is 645341504024502.

It is a happy number.

205420405143546 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 20 + 40 + 5 + 1 + 43 + 546 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5689037146 + ... + 5689073253.

It is an arithmetic number, because the mean of its divisors is an integer number (9984291876000).

Almost surely, 2^{205420405143546} is an apocalyptic number.

205420405143546 is an abundant number, since it is smaller than the sum of its proper divisors (273825604904454).

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

205420405143546 is a wasteful number, since it uses less digits than its factorization.

205420405143546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11378110483 (or 11378110480 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

The spelling of 205420405143546 in words is "two hundred five trillion, four hundred twenty billion, four hundred five million, one hundred forty-three thousand, five hundred forty-six".