561661760 has 56 divisors (see below), whose sum is σ = 1459053216. Its totient is φ = 204239360.

The previous prime is 561661753. The next prime is 561661801. The reversal of 561661760 is 67166165.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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, 76262 + ... + 83301.

Almost surely, 2^561661760 is an apocalyptic number.

It is an amenable number.

561661760 is an abundant number, since it is smaller than the sum of its proper divisors (897391456).

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

561661760 is a wasteful number, since it uses less digits than its factorization.

561661760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159591 (or 159581 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 561661760 is about 23699.4042119206. The cubic root of 561661760 is about 825.0715628158.

It can be divided in two parts, 5616 and 61760, that added together give a palindrome (67376).

The spelling of 561661760 in words is "five hundred sixty-one million, six hundred sixty-one thousand, seven hundred sixty".