1643955168 has 24 divisors (see below), whose sum is σ = 4315382568. Its totient is φ = 547985024.

The previous prime is 1643955167. The next prime is 1643955217. The reversal of 1643955168 is 8615593461.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643955167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8562171 + ... + 8562362.

It is an arithmetic number, because the mean of its divisors is an integer number (179807607).

Almost surely, 2^1643955168 is an apocalyptic number.

It is an amenable number.

1643955168 is an abundant number, since it is smaller than the sum of its proper divisors (2671427400).

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

1643955168 is a wasteful number, since it uses less digits than its factorization.

1643955168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124546 (or 17124538 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 1643955168 is about 40545.7170117881. The cubic root of 1643955168 is about 1180.2209602495.

The spelling of 1643955168 in words is "one billion, six hundred forty-three million, nine hundred fifty-five thousand, one hundred sixty-eight".