561515171712 has 256 divisors, whose sum is σ = 1686079584000. Its totient is φ = 164010147840.

The previous prime is 561515171687. The next prime is 561515171731. The reversal of 561515171712 is 217171515165.

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, 78761364 + ... + 78768492.

It is an arithmetic number, because the mean of its divisors is an integer number (6586248375).

Almost surely, 2^561515171712 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 561515171712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843039792000).

561515171712 is an abundant number, since it is smaller than the sum of its proper divisors (1124564412288).

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

561515171712 is a wasteful number, since it uses less digits than its factorization.

561515171712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7829 (or 7817 counting only the distinct ones).

The product of its digits is 73500, while the sum is 42.

Adding to 561515171712 its reverse (217171515165), we get a palindrome (778686686877).

The spelling of 561515171712 in words is "five hundred sixty-one billion, five hundred fifteen million, one hundred seventy-one thousand, seven hundred twelve".