6610661565 has 16 divisors (see below), whose sum is σ = 11199238848. Its totient is φ = 3318292736.

The previous prime is 6610661543. The next prime is 6610661567. The reversal of 6610661565 is 5651660166.

It is a cyclic number.

It is not a de Polignac number, because 6610661565 - 2⁶ = 6610661501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6610661567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12961827 + ... + 12962336.

It is an arithmetic number, because the mean of its divisors is an integer number (699952428).

Almost surely, 2^6610661565 is an apocalyptic number.

It is an amenable number.

6610661565 is a deficient number, since it is larger than the sum of its proper divisors (4588577283).

6610661565 is a wasteful number, since it uses less digits than its factorization.

6610661565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25924188.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6610661565 is about 81305.9749649434. The cubic root of 6610661565 is about 1876.7869485159.

The spelling of 6610661565 in words is "six billion, six hundred ten million, six hundred sixty-one thousand, five hundred sixty-five".