1646646222 has 128 divisors (see below), whose sum is σ = 3855237120. Its totient is φ = 464872320.

The previous prime is 1646646193. The next prime is 1646646277. The reversal of 1646646222 is 2226466461.

1646646222 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1646646222² = 5422887560853746568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4974597 + ... + 4974927.

It is an arithmetic number, because the mean of its divisors is an integer number (30119040).

Almost surely, 2^1646646222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646646222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1927618560).

1646646222 is an abundant number, since it is smaller than the sum of its proper divisors (2208590898).

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

1646646222 is a wasteful number, since it uses less digits than its factorization.

1646646222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its digits is 165888, while the sum is 39.

The square root of 1646646222 is about 40578.8888709388. Note that the first 4 decimals coincide. The cubic root of 1646646222 is about 1180.8645923425.

The spelling of 1646646222 in words is "one billion, six hundred forty-six million, six hundred forty-six thousand, two hundred twenty-two".