110611021661 has 24 divisors (see below), whose sum is σ = 137737764000. Its totient is φ = 88297068384.

The previous prime is 110611021643. The next prime is 110611021693. The reversal of 110611021661 is 166120116011.

It is a de Polignac number, because none of the positive numbers 2^k-110611021661 is a prime.

It is a super-2 number, since 2×110611021661² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 110611021661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110611021361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 951926 + ... + 1061783.

It is an arithmetic number, because the mean of its divisors is an integer number (5739073500).

Almost surely, 2^110611021661 is an apocalyptic number.

It is an amenable number.

110611021661 is a deficient number, since it is larger than the sum of its proper divisors (27126742339).

110611021661 is a wasteful number, since it uses less digits than its factorization.

110611021661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013801 (or 2013794 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 26.

Adding to 110611021661 its reverse (166120116011), we get a palindrome (276731137672).

The spelling of 110611021661 in words is "one hundred ten billion, six hundred eleven million, twenty-one thousand, six hundred sixty-one".