2111055661 has 24 divisors (see below), whose sum is σ = 2505656160. Its totient is φ = 1766735520.

The previous prime is 2111055659. The next prime is 2111055673. The reversal of 2111055661 is 1665501112.

It is a happy number.

It is not a de Polignac number, because 2111055661 - 2¹ = 2111055659 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111055061) 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, 657486 + ... + 660688.

It is an arithmetic number, because the mean of its divisors is an integer number (104402340).

Almost surely, 2^2111055661 is an apocalyptic number.

It is an amenable number.

2111055661 is a deficient number, since it is larger than the sum of its proper divisors (394600499).

2111055661 is a wasteful number, since it uses less digits than its factorization.

2111055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3646 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 2111055661 is about 45946.2257535916. The cubic root of 2111055661 is about 1282.8224787580.

Adding to 2111055661 its reverse (1665501112), we get a palindrome (3776556773).

The spelling of 2111055661 in words is "two billion, one hundred eleven million, fifty-five thousand, six hundred sixty-one".