1645233216 has 56 divisors (see below), whose sum is σ = 4748747424. Its totient is φ = 498554880.

The previous prime is 1645233181. The next prime is 1645233253. The reversal of 1645233216 is 6123325461.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387385 + ... + 391608.

Almost surely, 2^1645233216 is an apocalyptic number.

1645233216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1645233216 is an abundant number, since it is smaller than the sum of its proper divisors (3103514208).

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

1645233216 is a wasteful number, since it uses less digits than its factorization.

1645233216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779019 (or 779009 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 1645233216 is about 40561.4745294103. The cubic root of 1645233216 is about 1180.5267245334.

Adding to 1645233216 its reverse (6123325461), we get a palindrome (7768558677).

The spelling of 1645233216 in words is "one billion, six hundred forty-five million, two hundred thirty-three thousand, two hundred sixteen".