1643043652 has 6 divisors (see below), whose sum is σ = 2875326398. Its totient is φ = 821521824.

The previous prime is 1643043641. The next prime is 1643043671. The reversal of 1643043652 is 2563403461.

It can be written as a sum of positive squares in only one way, i.e., 1109156416 + 533887236 = 33304^2 + 23106^2 .

It is an unprimeable number.

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, 205380453 + ... + 205380460.

Almost surely, 2^1643043652 is an apocalyptic number.

It is an amenable number.

1643043652 is a deficient number, since it is larger than the sum of its proper divisors (1232282746).

1643043652 is a wasteful number, since it uses less digits than its factorization.

1643043652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410760917 (or 410760915 counting only the distinct ones).

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

The square root of 1643043652 is about 40534.4748578294. The cubic root of 1643043652 is about 1180.0027894217.

The spelling of 1643043652 in words is "one billion, six hundred forty-three million, forty-three thousand, six hundred fifty-two".