204693911608385 has 16 divisors (see below), whose sum is σ = 260395405419600. Its totient is φ = 153936560848896.

The previous prime is 204693911608379. The next prime is 204693911608423. The reversal of 204693911608385 is 583806119396402.

It is a Cunningham number, because it is equal to 14307128²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 204693911608384 = 1^2 + 14307128^2 .

It is a cyclic number.

It is not a de Polignac number, because 204693911608385 - 2¹⁶ = 204693911542849 is a prime.

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, 1452380480 + ... + 1452521409.

It is an arithmetic number, because the mean of its divisors is an integer number (16274712838725).

Almost surely, 2^{204693911608385} is an apocalyptic number.

It is an amenable number.

204693911608385 is a deficient number, since it is larger than the sum of its proper divisors (55701493811215).

204693911608385 is a wasteful number, since it uses less digits than its factorization.

204693911608385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904902740.

The product of its (nonzero) digits is 67184640, while the sum is 65.

The spelling of 204693911608385 in words is "two hundred four trillion, six hundred ninety-three billion, nine hundred eleven million, six hundred eight thousand, three hundred eighty-five".