1645424323 has 4 divisors (see below), whose sum is σ = 1646371168. Its totient is φ = 1644477480.

The previous prime is 1645424281. The next prime is 1645424329. The reversal of 1645424323 is 3234245461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1645424323 - 2²¹ = 1643327171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645424329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470811 + ... + 474292.

It is an arithmetic number, because the mean of its divisors is an integer number (411592792).

Almost surely, 2^1645424323 is an apocalyptic number.

1645424323 is a deficient number, since it is larger than the sum of its proper divisors (946845).

1645424323 is an equidigital number, since it uses as much as digits as its factorization.

1645424323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946844.

The product of its digits is 69120, while the sum is 34.

The square root of 1645424323 is about 40563.8302308843. The cubic root of 1645424323 is about 1180.5724319714.

Adding to 1645424323 its reverse (3234245461), we get a palindrome (4879669784).

The spelling of 1645424323 in words is "one billion, six hundred forty-five million, four hundred twenty-four thousand, three hundred twenty-three".