66500506506 has 48 divisors (see below), whose sum is σ = 160050500640. Its totient is φ = 18344964960.

The previous prime is 66500506417. The next prime is 66500506543. The reversal of 66500506506 is 60560500566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3891340 + ... + 3908391.

It is an arithmetic number, because the mean of its divisors is an integer number (3334385430).

Almost surely, 2^66500506506 is an apocalyptic number.

66500506506 is an abundant number, since it is smaller than the sum of its proper divisors (93549994134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66500506506 is a wasteful number, since it uses less digits than its factorization.

66500506506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7799779 (or 7799772 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 66500506506 in words is "sixty-six billion, five hundred million, five hundred six thousand, five hundred six".