204123512016455 has 16 divisors (see below), whose sum is σ = 247920442398720. Its totient is φ = 161317658336928.

The previous prime is 204123512016443. The next prime is 204123512016553. The reversal of 204123512016455 is 554610215321402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 204123512016455 - 2⁸ = 204123512016199 is a prime.

It is a congruent number.

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, 15981815 + ... + 25761704.

It is an arithmetic number, because the mean of its divisors is an integer number (15495027649920).

Almost surely, 2^{204123512016455} is an apocalyptic number.

204123512016455 is a deficient number, since it is larger than the sum of its proper divisors (43796930382265).

204123512016455 is a wasteful number, since it uses less digits than its factorization.

204123512016455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41755390.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 204123512016455 its reverse (554610215321402), we get a palindrome (758733727337857).

The spelling of 204123512016455 in words is "two hundred four trillion, one hundred twenty-three billion, five hundred twelve million, sixteen thousand, four hundred fifty-five".