405255314445521 has 2 divisors, whose sum is σ = 405255314445522. Its totient is φ = 405255314445520.

The previous prime is 405255314445511. The next prime is 405255314445581. The reversal of 405255314445521 is 125544413552504.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233028773478400 + 172226540967121 = 15265280^2 + 13123511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405255314445521 is a prime.

It is a super-2 number, since 2×405255314445521² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 405255314445521.

It is not a weakly prime, because it can be changed into another prime (405255314445511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202627657222760 + 202627657222761.

It is an arithmetic number, because the mean of its divisors is an integer number (202627657222761).

Almost surely, 2^{405255314445521} is an apocalyptic number.

It is an amenable number.

405255314445521 is a deficient number, since it is larger than the sum of its proper divisors (1).

405255314445521 is an equidigital number, since it uses as much as digits as its factorization.

405255314445521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600000, while the sum is 50.

The spelling of 405255314445521 in words is "four hundred five trillion, two hundred fifty-five billion, three hundred fourteen million, four hundred forty-five thousand, five hundred twenty-one".