105665021161 has 8 divisors (see below), whose sum is σ = 120779705984. Its totient is φ = 90555256800.

The previous prime is 105665021149. The next prime is 105665021167. The reversal of 105665021161 is 161120566501.

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 105665021161 - 2³⁵ = 71305282793 is a prime.

It is a super-2 number, since 2×105665021161² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105665021167) 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, 1183980 + ... + 1270093.

It is an arithmetic number, because the mean of its divisors is an integer number (15097463248).

Almost surely, 2^105665021161 is an apocalyptic number.

It is an amenable number.

105665021161 is a deficient number, since it is larger than the sum of its proper divisors (15114684823).

105665021161 is an equidigital number, since it uses as much as digits as its factorization.

105665021161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460231.

The product of its (nonzero) digits is 10800, while the sum is 34.

Adding to 105665021161 its reverse (161120566501), we get a palindrome (266785587662).

The spelling of 105665021161 in words is "one hundred five billion, six hundred sixty-five million, twenty-one thousand, one hundred sixty-one".