206560661660 has 24 divisors (see below), whose sum is σ = 433786896816. Its totient is φ = 82622453760.

The previous prime is 206560661647. The next prime is 206560661677. The reversal of 206560661660 is 66166065602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1185719 + ... + 1348721.

It is an arithmetic number, because the mean of its divisors is an integer number (18074454034).

Almost surely, 2^206560661660 is an apocalyptic number.

206560661660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206560661660 is an abundant number, since it is smaller than the sum of its proper divisors (227226235156).

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

206560661660 is a wasteful number, since it uses less digits than its factorization.

206560661660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226373 (or 226371 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 206560661660 in words is "two hundred six billion, five hundred sixty million, six hundred sixty-one thousand, six hundred sixty".