75565663 has 16 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 68939136.

The previous prime is 75565639. The next prime is 75565669. The reversal of 75565663 is 36656557.

It is a cyclic number.

It is not a de Polignac number, because 75565663 - 2⁹ = 75565151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75565669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121768 + ... + 122386.

It is an arithmetic number, because the mean of its divisors is an integer number (5155920).

Almost surely, 2^75565663 is an apocalyptic number.

75565663 is a deficient number, since it is larger than the sum of its proper divisors (6929057).

75565663 is a wasteful number, since it uses less digits than its factorization.

75565663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its digits is 567000, while the sum is 43.

The square root of 75565663 is about 8692.8512583617. The cubic root of 75565663 is about 422.7738975373.

The spelling of 75565663 in words is "seventy-five million, five hundred sixty-five thousand, six hundred sixty-three".