66556500663 has 16 divisors (see below), whose sum is σ = 91824076800. Its totient is φ = 42830696160.

The previous prime is 66556500583. The next prime is 66556500667. The reversal of 66556500663 is 36600565566.

It is not a de Polignac number, because 66556500663 - 2⁸ = 66556500407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66556500667) 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, 282018 + ... + 461136.

It is an arithmetic number, because the mean of its divisors is an integer number (5739004800).

Almost surely, 2^66556500663 is an apocalyptic number.

66556500663 is a deficient number, since it is larger than the sum of its proper divisors (25267576137).

66556500663 is a wasteful number, since it uses less digits than its factorization.

66556500663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183422.

The product of its (nonzero) digits is 2916000, while the sum is 48.

The spelling of 66556500663 in words is "sixty-six billion, five hundred fifty-six million, five hundred thousand, six hundred sixty-three".