3661122220111 has 4 divisors (see below), whose sum is σ = 3721140617224. Its totient is φ = 3601103823000.

The previous prime is 3661122220109. The next prime is 3661122220117. The reversal of 3661122220111 is 1110222211663.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3661122220111 - 2¹ = 3661122220109 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 3661122220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661122220117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30009198465 + ... + 30009198586.

It is an arithmetic number, because the mean of its divisors is an integer number (930285154306).

Almost surely, 2^{3661122220111} is an apocalyptic number.

3661122220111 is a deficient number, since it is larger than the sum of its proper divisors (60018397113).

3661122220111 is an equidigital number, since it uses as much as digits as its factorization.

3661122220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60018397112.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 3661122220111 its reverse (1110222211663), we get a palindrome (4771344431774).

The spelling of 3661122220111 in words is "three trillion, six hundred sixty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred eleven".