561003555840 has 704 divisors, whose sum is σ = 2253756825600. Its totient is φ = 118351134720.

The previous prime is 561003555799. The next prime is 561003555883. The reversal of 561003555840 is 48555300165.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 561003555792 and 561003555801.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68486145 + ... + 68494335.

Almost surely, 2^561003555840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561003555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1126878412800).

561003555840 is an abundant number, since it is smaller than the sum of its proper divisors (1692753269760).

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

561003555840 is a wasteful number, since it uses less digits than its factorization.

561003555840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253 (or 8221 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 561003555840 in words is "five hundred sixty-one billion, three million, five hundred fifty-five thousand, eight hundred forty".