561665066660 has 48 divisors (see below), whose sum is σ = 1192842878976. Its totient is φ = 222135967872.

The previous prime is 561665066629. The next prime is 561665066663. The reversal of 561665066660 is 66660566165.

It is not an unprimeable number, because it can be changed into a prime (561665066663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366869 + ... + 1121571.

It is an arithmetic number, because the mean of its divisors is an integer number (24850893312).

Almost surely, 2^561665066660 is an apocalyptic number.

It is an amenable number.

561665066660 is an abundant number, since it is smaller than the sum of its proper divisors (631177812316).

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

561665066660 is a wasteful number, since it uses less digits than its factorization.

561665066660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755132 (or 755130 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 561665066660 in words is "five hundred sixty-one billion, six hundred sixty-five million, sixty-six thousand, six hundred sixty".