1643029616 has 20 divisors (see below), whose sum is σ = 3193748712. Its totient is φ = 818836416.

The previous prime is 1643029603. The next prime is 1643029631. The reversal of 1643029616 is 6169203461.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1643029616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162335 + ... + 172158.

Almost surely, 2^1643029616 is an apocalyptic number.

1643029616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1643029616 is a deficient number, since it is larger than the sum of its proper divisors (1550719096).

1643029616 is a wasteful number, since it uses less digits than its factorization.

1643029616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334808 (or 334802 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 1643029616 is about 40534.3017208882. The cubic root of 1643029616 is about 1179.9994292825. Note that the first 3 decimals are identical.

The spelling of 1643029616 in words is "one billion, six hundred forty-three million, twenty-nine thousand, six hundred sixteen".