1645164445 has 8 divisors (see below), whose sum is σ = 1974488544. Its totient is φ = 1315937424.

The previous prime is 1645164439. The next prime is 1645164491. The reversal of 1645164445 is 5444615461.

It is a happy number.

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 1645164445 - 2⁵ = 1645164413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1645164398 and 1645164407.

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 7 ways as a sum of consecutive naturals, for example, 20542 + ... + 60928.

It is an arithmetic number, because the mean of its divisors is an integer number (246811068).

Almost surely, 2^1645164445 is an apocalyptic number.

It is an amenable number.

1645164445 is a deficient number, since it is larger than the sum of its proper divisors (329324099).

1645164445 is an equidigital number, since it uses as much as digits as its factorization.

1645164445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48539.

The product of its digits is 230400, while the sum is 40.

The square root of 1645164445 is about 40560.6267826324. The cubic root of 1645164445 is about 1180.5102755716.

The spelling of 1645164445 in words is "one billion, six hundred forty-five million, one hundred sixty-four thousand, four hundred forty-five".