655532043121 has 2 divisors, whose sum is σ = 655532043122. Its totient is φ = 655532043120.

The previous prime is 655532043083. The next prime is 655532043143. The reversal of 655532043121 is 121340235556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501208777521 + 154323265600 = 707961^2 + 392840^2 .

It is a cyclic number.

It is not a de Polignac number, because 655532043121 - 2²⁷ = 655397825393 is a prime.

It is not a weakly prime, because it can be changed into another prime (655532043721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327766021560 + 327766021561.

It is an arithmetic number, because the mean of its divisors is an integer number (327766021561).

Almost surely, 2^655532043121 is an apocalyptic number.

It is an amenable number.

655532043121 is a deficient number, since it is larger than the sum of its proper divisors (1).

655532043121 is an equidigital number, since it uses as much as digits as its factorization.

655532043121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 655532043121 its reverse (121340235556), we get a palindrome (776872278677).

The spelling of 655532043121 in words is "six hundred fifty-five billion, five hundred thirty-two million, forty-three thousand, one hundred twenty-one".