1643485503 has 32 divisors (see below), whose sum is σ = 2524262400. Its totient is φ = 940658400.

The previous prime is 1643485483. The next prime is 1643485507. The reversal of 1643485503 is 3055843461.

It is not a de Polignac number, because 1643485503 - 2⁵ = 1643485471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643485507) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 203578 + ... + 211496.

It is an arithmetic number, because the mean of its divisors is an integer number (78883200).

Almost surely, 2^1643485503 is an apocalyptic number.

1643485503 is a deficient number, since it is larger than the sum of its proper divisors (880776897).

1643485503 is a wasteful number, since it uses less digits than its factorization.

1643485503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8283.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 1643485503 is about 40539.9248025943. The cubic root of 1643485503 is about 1180.1085562773.

The spelling of 1643485503 in words is "one billion, six hundred forty-three million, four hundred eighty-five thousand, five hundred three".