205209205378 has 8 divisors (see below), whose sum is σ = 307898779968. Its totient is φ = 102576278724.

The previous prime is 205209205339. The next prime is 205209205381. The reversal of 205209205378 is 873502902502.

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

It is a super-2 number, since 2×205209205378² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14152926 + ... + 14167417.

It is an arithmetic number, because the mean of its divisors is an integer number (38487347496).

Almost surely, 2^205209205378 is an apocalyptic number.

205209205378 is a deficient number, since it is larger than the sum of its proper divisors (102689574590).

205209205378 is a wasteful number, since it uses less digits than its factorization.

205209205378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28323968.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 205209205378 in words is "two hundred five billion, two hundred nine million, two hundred five thousand, three hundred seventy-eight".