561612242040 has 128 divisors (see below), whose sum is σ = 1714855276800. Its totient is φ = 147099284480.

The previous prime is 561612242039. The next prime is 561612242053. The reversal of 561612242040 is 40242216165.

It is a junction number, because it is equal to n+sod(n) for n = 561612241992 and 561612242010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8413195 + ... + 8479685.

It is an arithmetic number, because the mean of its divisors is an integer number (13397306850).

Almost surely, 2^561612242040 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 561612242040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857427638400).

561612242040 is an abundant number, since it is smaller than the sum of its proper divisors (1153243034760).

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

561612242040 is a wasteful number, since it uses less digits than its factorization.

561612242040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67757 (or 67753 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 561612242040 in words is "five hundred sixty-one billion, six hundred twelve million, two hundred forty-two thousand, forty".