161001021110111 has 8 divisors (see below), whose sum is σ = 198155102904864. Its totient is φ = 127385423295840.

The previous prime is 161001021110071. The next prime is 161001021110143. The reversal of 161001021110111 is 111011120100161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161001021110111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161001021110111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161001021118111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884620995020 + ... + 884620995201.

It is an arithmetic number, because the mean of its divisors is an integer number (24769387863108).

Almost surely, 2^{161001021110111} is an apocalyptic number.

161001021110111 is a deficient number, since it is larger than the sum of its proper divisors (37154081794753).

161001021110111 is a wasteful number, since it uses less digits than its factorization.

161001021110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769241990241.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 161001021110111 its reverse (111011120100161), we get a palindrome (272012141210272).

The spelling of 161001021110111 in words is "one hundred sixty-one trillion, one billion, twenty-one million, one hundred ten thousand, one hundred eleven".