22125126661 has 4 divisors (see below), whose sum is σ = 24136501824. Its totient is φ = 20113751500.

The previous prime is 22125126649. The next prime is 22125126701. The reversal of 22125126661 is 16662152122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22125126661 - 2¹¹ = 22125124613 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 (22125126601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005687565 + ... + 1005687586.

It is an arithmetic number, because the mean of its divisors is an integer number (6034125456).

Almost surely, 2^22125126661 is an apocalyptic number.

It is an amenable number.

22125126661 is a deficient number, since it is larger than the sum of its proper divisors (2011375163).

22125126661 is a wasteful number, since it uses less digits than its factorization.

22125126661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011375162.

The product of its digits is 17280, while the sum is 34.

Adding to 22125126661 its reverse (16662152122), we get a palindrome (38787278783).

The spelling of 22125126661 in words is "twenty-two billion, one hundred twenty-five million, one hundred twenty-six thousand, six hundred sixty-one".