66210671161 has 4 divisors (see below), whose sum is σ = 66287750800. Its totient is φ = 66133591524.

The previous prime is 66210671141. The next prime is 66210671167. The reversal of 66210671161 is 16117601266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66210671161 - 2¹⁵ = 66210638393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66210671161.

It is not an unprimeable number, because it can be changed into a prime (66210671167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38538531 + ... + 38540248.

It is an arithmetic number, because the mean of its divisors is an integer number (16571937700).

Almost surely, 2^66210671161 is an apocalyptic number.

It is an amenable number.

66210671161 is a deficient number, since it is larger than the sum of its proper divisors (77079639).

66210671161 is an equidigital number, since it uses as much as digits as its factorization.

66210671161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77079638.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 66210671161 in words is "sixty-six billion, two hundred ten million, six hundred seventy-one thousand, one hundred sixty-one".