1643245255 has 16 divisors (see below), whose sum is σ = 2033817984. Its totient is φ = 1273868800.

The previous prime is 1643245237. The next prime is 1643245271. The reversal of 1643245255 is 5525423461.

It is not a de Polignac number, because 1643245255 - 2¹¹ = 1643243207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10882 + ... + 58351.

It is an arithmetic number, because the mean of its divisors is an integer number (127113624).

Almost surely, 2^1643245255 is an apocalyptic number.

1643245255 is a deficient number, since it is larger than the sum of its proper divisors (390572729).

1643245255 is a wasteful number, since it uses less digits than its factorization.

1643245255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69386.

The product of its digits is 144000, while the sum is 37.

The square root of 1643245255 is about 40536.9615906274. The cubic root of 1643245255 is about 1180.0510499316.

The spelling of 1643245255 in words is "one billion, six hundred forty-three million, two hundred forty-five thousand, two hundred fifty-five".