2211051661 has 16 divisors (see below), whose sum is σ = 2794847104. Its totient is φ = 1702119744.

The previous prime is 2211051643. The next prime is 2211051743. The reversal of 2211051661 is 1661501122.

It is a happy number.

2211051661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2211051661 - 2¹¹ = 2211049613 is a prime.

It is a super-2 number, since 2×2211051661² = 9777498895221717842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211051061) 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, 324975 + ... + 331708.

It is an arithmetic number, because the mean of its divisors is an integer number (174677944).

Almost surely, 2^2211051661 is an apocalyptic number.

It is an amenable number.

2211051661 is a deficient number, since it is larger than the sum of its proper divisors (583795443).

2211051661 is a wasteful number, since it uses less digits than its factorization.

2211051661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656740.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2211051661 is about 47021.8211153077. The cubic root of 2211051661 is about 1302.7656429194.

Adding to 2211051661 its reverse (1661501122), we get a palindrome (3872552783).

The spelling of 2211051661 in words is "two billion, two hundred eleven million, fifty-one thousand, six hundred sixty-one".