1645356543533 has 2 divisors, whose sum is σ = 1645356543534. Its totient is φ = 1645356543532.

The previous prime is 1645356543431. The next prime is 1645356543541. The reversal of 1645356543533 is 3353456535461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1415343261124 + 230013282409 = 1189682^2 + 479597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645356543533 - 2¹⁰ = 1645356542509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645356540533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822678271766 + 822678271767.

It is an arithmetic number, because the mean of its divisors is an integer number (822678271767).

Almost surely, 2^{1645356543533} is an apocalyptic number.

It is an amenable number.

1645356543533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645356543533 is an equidigital number, since it uses as much as digits as its factorization.

1645356543533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160000, while the sum is 53.

The spelling of 1645356543533 in words is "one trillion, six hundred forty-five billion, three hundred fifty-six million, five hundred forty-three thousand, five hundred thirty-three".