1643106506 has 8 divisors (see below), whose sum is σ = 2467708740. Its totient is φ = 820536928.

The previous prime is 1643106503. The next prime is 1643106527. The reversal of 1643106506 is 6056013461.

It can be written as a sum of positive squares in 2 ways, for example, as 1194048025 + 449058481 = 34555^2 + 21191^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1643106503) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 506141 + ... + 509376.

Almost surely, 2^1643106506 is an apocalyptic number.

1643106506 is a deficient number, since it is larger than the sum of its proper divisors (824602234).

1643106506 is a wasteful number, since it uses less digits than its factorization.

1643106506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016328.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1643106506 is about 40535.2501657508. The cubic root of 1643106506 is about 1180.0178360801.

Adding to 1643106506 its reverse (6056013461), we get a palindrome (7699119967).

The spelling of 1643106506 in words is "one billion, six hundred forty-three million, one hundred six thousand, five hundred six".