204155521322516 has 6 divisors (see below), whose sum is σ = 357272162314410. Its totient is φ = 102077760661256.

The previous prime is 204155521322443. The next prime is 204155521322531. The reversal of 204155521322516 is 615223125551402.

It can be written as a sum of positive squares in only one way, i.e., 166723101136900 + 37432420185616 = 12912130^2 + 6118204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25519440165311 + ... + 25519440165318.

It is an arithmetic number, because the mean of its divisors is an integer number (59545360385735).

Almost surely, 2^{204155521322516} is an apocalyptic number.

It is an amenable number.

204155521322516 is a deficient number, since it is larger than the sum of its proper divisors (153116640991894).

204155521322516 is a wasteful number, since it uses less digits than its factorization.

204155521322516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51038880330633 (or 51038880330631 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 44.

Adding to 204155521322516 its reverse (615223125551402), we get a palindrome (819378646873918).

The spelling of 204155521322516 in words is "two hundred four trillion, one hundred fifty-five billion, five hundred twenty-one million, three hundred twenty-two thousand, five hundred sixteen".