1645463321 has 8 divisors (see below), whose sum is σ = 1659319200. Its totient is φ = 1631653632.

The previous prime is 1645463311. The next prime is 1645463329. The reversal of 1645463321 is 1233645461.

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

It is a cyclic number.

It is not a de Polignac number, because 1645463321 - 2²⁶ = 1578354457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645463329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61946 + ... + 84428.

It is an arithmetic number, because the mean of its divisors is an integer number (207414900).

Almost surely, 2^1645463321 is an apocalyptic number.

It is an amenable number.

1645463321 is a deficient number, since it is larger than the sum of its proper divisors (13855879).

1645463321 is a wasteful number, since it uses less digits than its factorization.

1645463321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23095.

The product of its digits is 51840, while the sum is 35.

The square root of 1645463321 is about 40564.3109272178. The cubic root of 1645463321 is about 1180.5817587652.

The spelling of 1645463321 in words is "one billion, six hundred forty-five million, four hundred sixty-three thousand, three hundred twenty-one".