1561105016 has 16 divisors (see below), whose sum is σ = 2929878000. Its totient is φ = 779804224.

The previous prime is 1561105009. The next prime is 1561105043. The reversal of 1561105016 is 6105011651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84620 + ... + 101403.

It is an arithmetic number, because the mean of its divisors is an integer number (183117375).

Almost surely, 2^1561105016 is an apocalyptic number.

It is an amenable number.

1561105016 is a deficient number, since it is larger than the sum of its proper divisors (1368772984).

1561105016 is a wasteful number, since it uses less digits than its factorization.

1561105016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187078 (or 187074 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1561105016 is about 39510.8215050004. The cubic root of 1561105016 is about 1160.0517753347.

Adding to 1561105016 its reverse (6105011651), we get a palindrome (7666116667).

The spelling of 1561105016 in words is "one billion, five hundred sixty-one million, one hundred five thousand, sixteen".