1643063045 has 8 divisors (see below), whose sum is σ = 2123343096. Its totient is φ = 1213338816.

The previous prime is 1643063041. The next prime is 1643063089. The reversal of 1643063045 is 5403603461.

It can be written as a sum of positive squares in 4 ways, for example, as 62125924 + 1580937121 = 7882^2 + 39761^2 .

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 1643063045 - 2² = 1643063041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643063041) 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, 12638882 + ... + 12639011.

It is an arithmetic number, because the mean of its divisors is an integer number (265417887).

Almost surely, 2^1643063045 is an apocalyptic number.

It is an amenable number.

1643063045 is a deficient number, since it is larger than the sum of its proper divisors (480280051).

1643063045 is a wasteful number, since it uses less digits than its factorization.

1643063045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25277911.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1643063045 is about 40534.7140732484. The cubic root of 1643063045 is about 1180.0074319651.

The spelling of 1643063045 in words is "one billion, six hundred forty-three million, sixty-three thousand, forty-five".