204660666601 has 4 divisors (see below), whose sum is σ = 205278977104. Its totient is φ = 204042356100.

The previous prime is 204660666593. The next prime is 204660666611. The reversal of 204660666601 is 106666066402.

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 204660666601 - 2³ = 204660666593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204660666611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309154755 + ... + 309155416.

It is an arithmetic number, because the mean of its divisors is an integer number (51319744276).

Almost surely, 2^204660666601 is an apocalyptic number.

It is an amenable number.

204660666601 is a deficient number, since it is larger than the sum of its proper divisors (618310503).

204660666601 is an equidigital number, since it uses as much as digits as its factorization.

204660666601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618310502.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 204660666601 in words is "two hundred four billion, six hundred sixty million, six hundred sixty-six thousand, six hundred one".