66650470161 has 8 divisors (see below), whose sum is σ = 96946138464. Its totient is φ = 40394224320.

The previous prime is 66650470157. The next prime is 66650470163. The reversal of 66650470161 is 16107405666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66650470161 - 2² = 66650470157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66650470163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009855576 + ... + 1009855641.

It is an arithmetic number, because the mean of its divisors is an integer number (12118267308).

Almost surely, 2^66650470161 is an apocalyptic number.

It is an amenable number.

66650470161 is a deficient number, since it is larger than the sum of its proper divisors (30295668303).

66650470161 is a wasteful number, since it uses less digits than its factorization.

66650470161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019711231.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 66650470161 in words is "sixty-six billion, six hundred fifty million, four hundred seventy thousand, one hundred sixty-one".