1561065066 has 24 divisors (see below), whose sum is σ = 3689790624. Its totient is φ = 473049960.

The previous prime is 1561065059. The next prime is 1561065083. The reversal of 1561065066 is 6605601651.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561065066.

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, 3941886 + ... + 3942281.

It is an arithmetic number, because the mean of its divisors is an integer number (153741276).

Almost surely, 2^1561065066 is an apocalyptic number.

1561065066 is an abundant number, since it is smaller than the sum of its proper divisors (2128725558).

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

1561065066 is a wasteful number, since it uses less digits than its factorization.

1561065066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7884186 (or 7884183 counting only the distinct ones).

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

The square root of 1561065066 is about 39510.3159440671. The cubic root of 1561065066 is about 1160.0418796810.

The spelling of 1561065066 in words is "one billion, five hundred sixty-one million, sixty-five thousand, sixty-six".