11056111661 has 16 divisors (see below), whose sum is σ = 13224117504. Its totient is φ = 9037695744.

The previous prime is 11056111621. The next prime is 11056111663. The reversal of 11056111661 is 16611165011.

It is a happy number.

It is not a de Polignac number, because 11056111661 - 2¹⁴ = 11056095277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11056111663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47630 + ... + 156143.

It is an arithmetic number, because the mean of its divisors is an integer number (826507344).

Almost surely, 2^11056111661 is an apocalyptic number.

It is an amenable number.

11056111661 is a deficient number, since it is larger than the sum of its proper divisors (2168005843).

11056111661 is a wasteful number, since it uses less digits than its factorization.

11056111661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204140.

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 11056111661 its reverse (16611165011), we get a palindrome (27667276672).

The spelling of 11056111661 in words is "eleven billion, fifty-six million, one hundred eleven thousand, six hundred sixty-one".