2223123665661 has 60 divisors (see below), whose sum is σ = 3711123677052. Its totient is φ = 1321484979456.

The previous prime is 2223123665603. The next prime is 2223123665681. The reversal of 2223123665661 is 1665663213222.

2223123665661 is a `hidden beast` number, since 2 + 2 + 2 + 3 + 1 + 23 + 66 + 566 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1118953533636 + 1104170132025 = 1057806^2 + 1050795^2 .

It is not a de Polignac number, because 2223123665661 - 2⁹ = 2223123665149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2223123665681) 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 59 ways as a sum of consecutive naturals, for example, 1739010 + ... + 2733203.

Almost surely, 2^{2223123665661} is an apocalyptic number.

It is an amenable number.

2223123665661 is a deficient number, since it is larger than the sum of its proper divisors (1488000011391).

2223123665661 is a wasteful number, since it uses less digits than its factorization.

2223123665661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472280 (or 4472252 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

Adding to 2223123665661 its reverse (1665663213222), we get a palindrome (3888786878883).

The spelling of 2223123665661 in words is "two trillion, two hundred twenty-three billion, one hundred twenty-three million, six hundred sixty-five thousand, six hundred sixty-one".