561001555236 has 96 divisors (see below), whose sum is σ = 1393328782720. Its totient is φ = 175177728000.

The previous prime is 561001555133. The next prime is 561001555243. The reversal of 561001555236 is 632555100165.

It is a junction number, because it is equal to n+sod(n) for n = 561001555194 and 561001555203.

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, 26550756 + ... + 26571876.

Almost surely, 2^561001555236 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 561001555236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696664391360).

561001555236 is an abundant number, since it is smaller than the sum of its proper divisors (832327227484).

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

561001555236 is a wasteful number, since it uses less digits than its factorization.

561001555236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22445 (or 22443 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 561001555236 in words is "five hundred sixty-one billion, one million, five hundred fifty-five thousand, two hundred thirty-six".