205478220042 has 32 divisors (see below), whose sum is σ = 476471237760. Its totient is φ = 65514794400.

The previous prime is 205478220011. The next prime is 205478220053. The reversal of 205478220042 is 240022874502.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 205478219979 and 205478220006.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82719459 + ... + 82721942.

It is an arithmetic number, because the mean of its divisors is an integer number (14889726180).

Almost surely, 2^205478220042 is an apocalyptic number.

205478220042 is an abundant number, since it is smaller than the sum of its proper divisors (270993017718).

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

205478220042 is a wasteful number, since it uses less digits than its factorization.

205478220042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165441435 (or 165441429 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 36.

The spelling of 205478220042 in words is "two hundred five billion, four hundred seventy-eight million, two hundred twenty thousand, forty-two".