205612400106664 has 8 divisors (see below), whose sum is σ = 385523250200010. Its totient is φ = 102806200053328.

The previous prime is 205612400106577. The next prime is 205612400106691. The reversal of 205612400106664 is 466601004216502.

It can be written as a sum of positive squares in only one way, i.e., 128294812492900 + 77317587613764 = 11326730^2 + 8793042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 205612400106664.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850775006659 + ... + 12850775006674.

Almost surely, 2^{205612400106664} is an apocalyptic number.

It is an amenable number.

205612400106664 is a deficient number, since it is larger than the sum of its proper divisors (179910850093346).

205612400106664 is a wasteful number, since it uses less digits than its factorization.

205612400106664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25701550013339 (or 25701550013335 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 205612400106664 in words is "two hundred five trillion, six hundred twelve billion, four hundred million, one hundred six thousand, six hundred sixty-four".