561061660 has 24 divisors (see below), whose sum is σ = 1183822416. Its totient is φ = 223359360.

The previous prime is 561061649. The next prime is 561061661. The reversal of 561061660 is 66160165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561061661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62257 + ... + 70696.

It is an arithmetic number, because the mean of its divisors is an integer number (49325934).

Almost surely, 2^561061660 is an apocalyptic number.

It is an amenable number.

561061660 is an abundant number, since it is smaller than the sum of its proper divisors (622760756).

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

561061660 is a wasteful number, since it uses less digits than its factorization.

561061660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133173 (or 133171 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 561061660 is about 23686.7401725100. The cubic root of 561061660 is about 824.7776125409. Note that the first 3 decimals are identical.

The spelling of 561061660 in words is "five hundred sixty-one million, sixty-one thousand, six hundred sixty".