1643485504 has 14 divisors (see below), whose sum is σ = 3261291674. Its totient is φ = 821742720.

The previous prime is 1643485483. The next prime is 1643485507. The reversal of 1643485504 is 4055843461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1493667904 + 149817600 = 38648^2 + 12240^2 .

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 polite number, since it can be written as a sum of consecutive naturals, namely, 12839667 + ... + 12839794.

Almost surely, 2^1643485504 is an apocalyptic number.

It is an amenable number.

1643485504 is a deficient number, since it is larger than the sum of its proper divisors (1617806170).

1643485504 is an equidigital number, since it uses as much as digits as its factorization.

1643485504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25679473 (or 25679463 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 1643485504 is about 40539.9248149278. The cubic root of 1643485504 is about 1180.1085565167.

The spelling of 1643485504 in words is "one billion, six hundred forty-three million, four hundred eighty-five thousand, five hundred four".