1561061016 has 48 divisors (see below), whose sum is σ = 4229971200. Its totient is φ = 520095552.

The previous prime is 1561061009. The next prime is 1561061041. The reversal of 1561061016 is 6101601651.

It is a super-2 number, since 2×1561061016² = 4873822991349904512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189430 + ... + 197498.

It is an arithmetic number, because the mean of its divisors is an integer number (88124400).

Almost surely, 2^1561061016 is an apocalyptic number.

It is an amenable number.

1561061016 is an abundant number, since it is smaller than the sum of its proper divisors (2668910184).

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

1561061016 is a wasteful number, since it uses less digits than its factorization.

1561061016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10768 (or 10761 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1561061016 is about 39510.2646915963. The cubic root of 1561061016 is about 1160.0408764827.

Adding to 1561061016 its reverse (6101601651), we get a palindrome (7662662667).

The spelling of 1561061016 in words is "one billion, five hundred sixty-one million, sixty-one thousand, sixteen".