1561065065 has 32 divisors (see below), whose sum is σ = 2162280960. Its totient is φ = 1059807744.

The previous prime is 1561065059. The next prime is 1561065083. The reversal of 1561065065 is 5605601651.

1561065065 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1561065065 - 2¹⁰ = 1561064041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon 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, 2390279 + ... + 2390931.

It is an arithmetic number, because the mean of its divisors is an integer number (67571280).

Almost surely, 2^1561065065 is an apocalyptic number.

It is an amenable number.

1561065065 is a deficient number, since it is larger than the sum of its proper divisors (601215895).

1561065065 is a wasteful number, since it uses less digits than its factorization.

1561065065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1561065065 is about 39510.3159314121. The cubic root of 1561065065 is about 1160.0418794333.

The spelling of 1561065065 in words is "one billion, five hundred sixty-one million, sixty-five thousand, sixty-five".