213443123655661 has 8 divisors (see below), whose sum is σ = 213731670617600. Its totient is φ = 213154771596480.

The previous prime is 213443123655653. The next prime is 213443123655733. The reversal of 213443123655661 is 166556321344312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213443123655661 - 2³ = 213443123655653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213443123655599 and 213443123655608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443123655611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46533891 + ... + 50914528.

It is an arithmetic number, because the mean of its divisors is an integer number (26716458827200).

Almost surely, 2^{213443123655661} is an apocalyptic number.

It is an amenable number.

213443123655661 is a deficient number, since it is larger than the sum of its proper divisors (288546961939).

213443123655661 is a wasteful number, since it uses less digits than its factorization.

213443123655661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97451379.

The product of its digits is 9331200, while the sum is 52.

Adding to 213443123655661 its reverse (166556321344312), we get a palindrome (379999444999973).

The spelling of 213443123655661 in words is "two hundred thirteen trillion, four hundred forty-three billion, one hundred twenty-three million, six hundred fifty-five thousand, six hundred sixty-one".