1645164222 has 64 divisors (see below), whose sum is σ = 3759545664. Its totient is φ = 475453440.

The previous prime is 1645164197. The next prime is 1645164233. The reversal of 1645164222 is 2224615461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 875548 + ... + 877424.

It is an arithmetic number, because the mean of its divisors is an integer number (58742901).

Almost surely, 2^1645164222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645164222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879772832).

1645164222 is an abundant number, since it is smaller than the sum of its proper divisors (2114381442).

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

1645164222 is a wasteful number, since it uses less digits than its factorization.

1645164222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573.

The product of its digits is 23040, while the sum is 33.

The square root of 1645164222 is about 40560.6240336610. The cubic root of 1645164222 is about 1180.5102222327.

Adding to 1645164222 its reverse (2224615461), we get a palindrome (3869779683).

The spelling of 1645164222 in words is "one billion, six hundred forty-five million, one hundred sixty-four thousand, two hundred twenty-two".