661056065 has 8 divisors (see below), whose sum is σ = 793731840. Its totient is φ = 528535152.

The previous prime is 661056049. The next prime is 661056223. The reversal of 661056065 is 560650166.

661056065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661056065 - 2⁴ = 661056049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29105 + ... + 46574.

It is an arithmetic number, because the mean of its divisors is an integer number (99216480).

Almost surely, 2^661056065 is an apocalyptic number.

It is an amenable number.

661056065 is a deficient number, since it is larger than the sum of its proper divisors (132675775).

661056065 is a wasteful number, since it uses less digits than its factorization.

661056065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77431.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 661056065 is about 25711.0105791274. The cubic root of 661056065 is about 871.1229015785.

The spelling of 661056065 in words is "six hundred sixty-one million, fifty-six thousand, sixty-five".