1643004645 has 8 divisors (see below), whose sum is σ = 2628807456. Its totient is φ = 876269136.

The previous prime is 1643004637. The next prime is 1643004667. The reversal of 1643004645 is 5464003461.

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

It is not a de Polignac number, because 1643004645 - 2³ = 1643004637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54766807 + ... + 54766836.

It is an arithmetic number, because the mean of its divisors is an integer number (328600932).

Almost surely, 2^1643004645 is an apocalyptic number.

1643004645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1643004645 is a deficient number, since it is larger than the sum of its proper divisors (985802811).

1643004645 is a wasteful number, since it uses less digits than its factorization.

1643004645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109533651.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1643004645 is about 40533.9936966492. The cubic root of 1643004645 is about 1179.9934513186.

The spelling of 1643004645 in words is "one billion, six hundred forty-three million, four thousand, six hundred forty-five".