1645172322 has 8 divisors (see below), whose sum is σ = 3290344656. Its totient is φ = 548390772.

The previous prime is 1645172261. The next prime is 1645172377. The reversal of 1645172322 is 2232715461.

It is a sphenic number, since it is the product of 3 distinct primes.

1645172322 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137097688 + ... + 137097699.

It is an arithmetic number, because the mean of its divisors is an integer number (411293082).

Almost surely, 2^1645172322 is an apocalyptic number.

1645172322 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1645172322 is a wasteful number, since it uses less digits than its factorization.

1645172322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274195392.

The product of its digits is 20160, while the sum is 33.

The square root of 1645172322 is about 40560.7238840729. The cubic root of 1645172322 is about 1180.5121596517.

Adding to 1645172322 its reverse (2232715461), we get a palindrome (3877887783).

The spelling of 1645172322 in words is "one billion, six hundred forty-five million, one hundred seventy-two thousand, three hundred twenty-two".