1643022816 has 48 divisors (see below), whose sum is σ = 4452069888. Its totient is φ = 530006400.

The previous prime is 1643022791. The next prime is 1643022839. The reversal of 1643022816 is 6182203461.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273070 + ... + 279021.

It is an arithmetic number, because the mean of its divisors is an integer number (92751456).

Almost surely, 2^1643022816 is an apocalyptic number.

1643022816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1643022816 is an abundant number, since it is smaller than the sum of its proper divisors (2809047072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643022816 is a wasteful number, since it uses less digits than its factorization.

1643022816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552135 (or 552127 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1643022816 is about 40534.2178412264. The cubic root of 1643022816 is about 1179.9978013940.

The spelling of 1643022816 in words is "one billion, six hundred forty-three million, twenty-two thousand, eight hundred sixteen".