561909917440 has 36 divisors (see below), whose sum is σ = 1345949852184. Its totient is φ = 224763966464.

The previous prime is 561909917407. The next prime is 561909917447. The reversal of 561909917440 is 44719909165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561909917447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219494782 + ... + 219497341.

It is an arithmetic number, because the mean of its divisors is an integer number (37387495894).

Almost surely, 2^561909917440 is an apocalyptic number.

It is an amenable number.

561909917440 is an abundant number, since it is smaller than the sum of its proper divisors (784039934744).

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

561909917440 is an equidigital number, since it uses as much as digits as its factorization.

561909917440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438992144 (or 438992130 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 561909917440 in words is "five hundred sixty-one billion, nine hundred nine million, nine hundred seventeen thousand, four hundred forty".