1111642110661 has 2 divisors, whose sum is σ = 1111642110662. Its totient is φ = 1111642110660.

The previous prime is 1111642110629. The next prime is 1111642110673. The reversal of 1111642110661 is 1660112461111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1016033760225 + 95608350436 = 1007985^2 + 309206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111642110661 - 2⁵ = 1111642110629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111642110611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555821055330 + 555821055331.

It is an arithmetic number, because the mean of its divisors is an integer number (555821055331).

Almost surely, 2^{1111642110661} is an apocalyptic number.

It is an amenable number.

1111642110661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111642110661 is an equidigital number, since it uses as much as digits as its factorization.

1111642110661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

Adding to 1111642110661 its reverse (1660112461111), we get a palindrome (2771754571772).

The spelling of 1111642110661 in words is "one trillion, one hundred eleven billion, six hundred forty-two million, one hundred ten thousand, six hundred sixty-one".