204513197779378 has 8 divisors (see below), whose sum is σ = 306773725870080. Its totient is φ = 102255289156020.

The previous prime is 204513197779351. The next prime is 204513197779393. The reversal of 204513197779378 is 873977791315402.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 204513197779378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654671638 + ... + 654983953.

It is an arithmetic number, because the mean of its divisors is an integer number (38346715733760).

Almost surely, 2^{204513197779378} is an apocalyptic number.

204513197779378 is a deficient number, since it is larger than the sum of its proper divisors (102260528090702).

204513197779378 is a wasteful number, since it uses less digits than its factorization.

204513197779378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309733672.

The product of its (nonzero) digits is 560105280, while the sum is 73.

The spelling of 204513197779378 in words is "two hundred four trillion, five hundred thirteen billion, one hundred ninety-seven million, seven hundred seventy-nine thousand, three hundred seventy-eight".