204451500404161 has 4 divisors (see below), whose sum is σ = 204474506095552. Its totient is φ = 204428494712772.

The previous prime is 204451500404147. The next prime is 204451500404191. The reversal of 204451500404161 is 161404005154402.

204451500404161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204451500404161 - 2¹³ = 204451500395969 is a prime.

It is a super-2 number, since 2×204451500404161² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204451500404161.

It is not an unprimeable number, because it can be changed into a prime (204451500404191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11502832365 + ... + 11502850138.

It is an arithmetic number, because the mean of its divisors is an integer number (51118626523888).

Almost surely, 2^{204451500404161} is an apocalyptic number.

It is an amenable number.

204451500404161 is a deficient number, since it is larger than the sum of its proper divisors (23005691391).

204451500404161 is an equidigital number, since it uses as much as digits as its factorization.

204451500404161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23005691390.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 204451500404161 its reverse (161404005154402), we get a palindrome (365855505558563).

The spelling of 204451500404161 in words is "two hundred four trillion, four hundred fifty-one billion, five hundred million, four hundred four thousand, one hundred sixty-one".