1643794445 has 8 divisors (see below), whose sum is σ = 1981903200. Its totient is φ = 1308802320.

The previous prime is 1643794433. The next prime is 1643794483. The reversal of 1643794445 is 5444973461.

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

It is not a de Polignac number, because 1643794445 - 2³⁰ = 570052621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643794445.

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, 777995 + ... + 780104.

It is an arithmetic number, because the mean of its divisors is an integer number (247737900).

Almost surely, 2^1643794445 is an apocalyptic number.

It is an amenable number.

1643794445 is a deficient number, since it is larger than the sum of its proper divisors (338108755).

1643794445 is a wasteful number, since it uses less digits than its factorization.

1643794445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558315.

The product of its digits is 1451520, while the sum is 47.

The square root of 1643794445 is about 40543.7349660832. The cubic root of 1643794445 is about 1180.1824971496.

The spelling of 1643794445 in words is "one billion, six hundred forty-three million, seven hundred ninety-four thousand, four hundred forty-five".