1645043263 has 2 divisors, whose sum is σ = 1645043264. Its totient is φ = 1645043262.

The previous prime is 1645043227. The next prime is 1645043269. The reversal of 1645043263 is 3623405461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645043263 - 2²¹ = 1642946111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645043269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822521631 + 822521632.

It is an arithmetic number, because the mean of its divisors is an integer number (822521632).

Almost surely, 2^1645043263 is an apocalyptic number.

1645043263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645043263 is an equidigital number, since it uses as much as digits as its factorization.

1645043263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 1645043263 is about 40559.1329172604. The cubic root of 1645043263 is about 1180.4812895921.

The spelling of 1645043263 in words is "one billion, six hundred forty-five million, forty-three thousand, two hundred sixty-three".