205413663660 has 24 divisors (see below), whose sum is σ = 575158258416. Its totient is φ = 54776976960.

The previous prime is 205413663647. The next prime is 205413663667. The reversal of 205413663660 is 66366314502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (205413663667) 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 7 ways as a sum of consecutive naturals, for example, 1711780471 + ... + 1711780590.

It is an arithmetic number, because the mean of its divisors is an integer number (23964927434).

Almost surely, 2^205413663660 is an apocalyptic number.

205413663660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205413663660 is an abundant number, since it is smaller than the sum of its proper divisors (369744594756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205413663660 is a wasteful number, since it uses less digits than its factorization.

205413663660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423561073 (or 3423561071 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 205413663660 in words is "two hundred five billion, four hundred thirteen million, six hundred sixty-three thousand, six hundred sixty".