1643743122 has 64 divisors (see below), whose sum is σ = 3880396800. Its totient is φ = 463934352.

The previous prime is 1643743121. The next prime is 1643743159. The reversal of 1643743122 is 2213473461.

It is a super-2 number, since 2×1643743122² = 5403782902244613768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643743121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166003 + ... + 175625.

It is an arithmetic number, because the mean of its divisors is an integer number (60631200).

Almost surely, 2^1643743122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643743122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1940198400).

1643743122 is an abundant number, since it is smaller than the sum of its proper divisors (2236653678).

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

1643743122 is an equidigital number, since it uses as much as digits as its factorization.

1643743122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9732 (or 9718 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 1643743122 is about 40543.1020273486. The cubic root of 1643743122 is about 1180.1702143615.

The spelling of 1643743122 in words is "one billion, six hundred forty-three million, seven hundred forty-three thousand, one hundred twenty-two".