210666366161 has 8 divisors (see below), whose sum is σ = 217478751744. Its totient is φ = 203855024160.

The previous prime is 210666366143. The next prime is 210666366191. The reversal of 210666366161 is 161663666012.

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 210666366161 - 2¹⁰ = 210666365137 is a prime.

It is a super-5 number, since 5×210666366161⁵ (a number of 58 digits) contains 55555 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210666366191) 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, 160181 + ... + 668573.

It is an arithmetic number, because the mean of its divisors is an integer number (27184843968).

Almost surely, 2^210666366161 is an apocalyptic number.

It is an amenable number.

210666366161 is a deficient number, since it is larger than the sum of its proper divisors (6812385583).

210666366161 is a wasteful number, since it uses less digits than its factorization.

210666366161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521791.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 210666366161 in words is "two hundred ten billion, six hundred sixty-six million, three hundred sixty-six thousand, one hundred sixty-one".