66500156601 has 8 divisors (see below), whose sum is σ = 98518750560. Its totient is φ = 44333437716.

The previous prime is 66500156551. The next prime is 66500156669. The reversal of 66500156601 is 10665100566.

It is not a de Polignac number, because 66500156601 - 2⁶ = 66500156537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66500156101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1231484355 + ... + 1231484408.

It is an arithmetic number, because the mean of its divisors is an integer number (12314843820).

Almost surely, 2^66500156601 is an apocalyptic number.

It is an amenable number.

66500156601 is a deficient number, since it is larger than the sum of its proper divisors (32018593959).

66500156601 is a wasteful number, since it uses less digits than its factorization.

66500156601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462968772 (or 2462968766 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 66500156601 in words is "sixty-six billion, five hundred million, one hundred fifty-six thousand, six hundred one".