545312505213521 has 2 divisors, whose sum is σ = 545312505213522. Its totient is φ = 545312505213520.

The previous prime is 545312505213473. The next prime is 545312505213557. The reversal of 545312505213521 is 125312505213545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368365683051025 + 176946822162496 = 19192855^2 + 13302136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545312505213521 is a prime.

It is not a weakly prime, because it can be changed into another prime (545312505233521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272656252606760 + 272656252606761.

It is an arithmetic number, because the mean of its divisors is an integer number (272656252606761).

Almost surely, 2^{545312505213521} is an apocalyptic number.

It is an amenable number.

545312505213521 is a deficient number, since it is larger than the sum of its proper divisors (1).

545312505213521 is an equidigital number, since it uses as much as digits as its factorization.

545312505213521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 545312505213521 in words is "five hundred forty-five trillion, three hundred twelve billion, five hundred five million, two hundred thirteen thousand, five hundred twenty-one".