71666563 has 8 divisors (see below), whose sum is σ = 72711936. Its totient is φ = 70629000.

The previous prime is 71666561. The next prime is 71666579. The reversal of 71666563 is 36566617.

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 71666563 - 2¹ = 71666561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71666561) 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 7 ways as a sum of consecutive naturals, for example, 17970 + ... + 21592.

It is an arithmetic number, because the mean of its divisors is an integer number (9088992).

Almost surely, 2^71666563 is an apocalyptic number.

71666563 is a deficient number, since it is larger than the sum of its proper divisors (1045373).

71666563 is a wasteful number, since it uses less digits than its factorization.

71666563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905.

The product of its digits is 136080, while the sum is 40.

The square root of 71666563 is about 8465.6106099915. The cubic root of 71666563 is about 415.3735698507.

The spelling of 71666563 in words is "seventy-one million, six hundred sixty-six thousand, five hundred sixty-three".