545422321621 has 2 divisors, whose sum is σ = 545422321622. Its totient is φ = 545422321620.

The previous prime is 545422321583. The next prime is 545422321687. The reversal of 545422321621 is 126123224545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524719140625 + 20703180996 = 724375^2 + 143886^2 .

It is a cyclic number.

It is not a de Polignac number, because 545422321621 - 2¹⁷ = 545422190549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545422321721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272711160810 + 272711160811.

It is an arithmetic number, because the mean of its divisors is an integer number (272711160811).

Almost surely, 2^545422321621 is an apocalyptic number.

It is an amenable number.

545422321621 is a deficient number, since it is larger than the sum of its proper divisors (1).

545422321621 is an equidigital number, since it uses as much as digits as its factorization.

545422321621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 37.

The spelling of 545422321621 in words is "five hundred forty-five billion, four hundred twenty-two million, three hundred twenty-one thousand, six hundred twenty-one".