1645442566 has 8 divisors (see below), whose sum is σ = 2479861944. Its totient is φ = 818821920.

The previous prime is 1645442549. The next prime is 1645442569. The reversal of 1645442566 is 6652445461.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645442569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1949155 + ... + 1949998.

It is an arithmetic number, because the mean of its divisors is an integer number (309982743).

Almost surely, 2^1645442566 is an apocalyptic number.

1645442566 is a deficient number, since it is larger than the sum of its proper divisors (834419378).

1645442566 is a wasteful number, since it uses less digits than its factorization.

1645442566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899366.

The product of its digits is 691200, while the sum is 43.

The square root of 1645442566 is about 40564.0550980791. The cubic root of 1645442566 is about 1180.5767950007.

The spelling of 1645442566 in words is "one billion, six hundred forty-five million, four hundred forty-two thousand, five hundred sixty-six".