252557622241621 has 2 divisors, whose sum is σ = 252557622241622. Its totient is φ = 252557622241620.

The previous prime is 252557622241607. The next prime is 252557622241679. The reversal of 252557622241621 is 126142226755252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211054212567025 + 41503409674596 = 14527705^2 + 6442314^2 .

It is a cyclic number.

It is not a de Polignac number, because 252557622241621 - 2¹⁹ = 252557621717333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252557622211621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126278811120810 + 126278811120811.

It is an arithmetic number, because the mean of its divisors is an integer number (126278811120811).

Almost surely, 2^{252557622241621} is an apocalyptic number.

It is an amenable number.

252557622241621 is a deficient number, since it is larger than the sum of its proper divisors (1).

252557622241621 is an equidigital number, since it uses as much as digits as its factorization.

252557622241621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064000, while the sum is 52.

Adding to 252557622241621 its reverse (126142226755252), we get a palindrome (378699848996873).

The spelling of 252557622241621 in words is "two hundred fifty-two trillion, five hundred fifty-seven billion, six hundred twenty-two million, two hundred forty-one thousand, six hundred twenty-one".