1561065606 has 12 divisors (see below), whose sum is σ = 3382308852. Its totient is φ = 520355196.

The previous prime is 1561065599. The next prime is 1561065641. The reversal of 1561065606 is 6065601651.

1561065606 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1561065606² = 4873851652472294472, 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 5 ways as a sum of consecutive naturals, for example, 43362916 + ... + 43362951.

It is an arithmetic number, because the mean of its divisors is an integer number (281859071).

Almost surely, 2^1561065606 is an apocalyptic number.

1561065606 is an abundant number, since it is smaller than the sum of its proper divisors (1821243246).

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

1561065606 is a wasteful number, since it uses less digits than its factorization.

1561065606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86725875 (or 86725872 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1561065606 is about 39510.3227777248. The cubic root of 1561065606 is about 1160.0420134407.

The spelling of 1561065606 in words is "one billion, five hundred sixty-one million, sixty-five thousand, six hundred six".