205440162122656 has 12 divisors (see below), whose sum is σ = 404460319179042. Its totient is φ = 102720081061312.

The previous prime is 205440162122639. The next prime is 205440162122669. The reversal of 205440162122656 is 656221261044502.

It is a happy number.

205440162122656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 200236197434256 + 5203964688400 = 14150484^2 + 2281220^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210002533135 + ... + 3210002533198.

Almost surely, 2^{205440162122656} is an apocalyptic number.

It is an amenable number.

205440162122656 is a deficient number, since it is larger than the sum of its proper divisors (199020157056386).

205440162122656 is an equidigital number, since it uses as much as digits as its factorization.

205440162122656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420005066343 (or 6420005066335 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 46.

The spelling of 205440162122656 in words is "two hundred five trillion, four hundred forty billion, one hundred sixty-two million, one hundred twenty-two thousand, six hundred fifty-six".