2006643769 has 16 divisors (see below), whose sum is σ = 2196149760. Its totient is φ = 1822233600.

The previous prime is 2006643703. The next prime is 2006643787. The reversal of 2006643769 is 9673466002.

It is a cyclic number.

It is not a de Polignac number, because 2006643769 - 2⁷ = 2006643641 is a prime.

It is a super-2 number, since 2×2006643769² = 8053238431333050722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006643799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1252569 + ... + 1254169.

It is an arithmetic number, because the mean of its divisors is an integer number (137259360).

Almost surely, 2^2006643769 is an apocalyptic number.

It is an amenable number.

2006643769 is a deficient number, since it is larger than the sum of its proper divisors (189505991).

2006643769 is a wasteful number, since it uses less digits than its factorization.

2006643769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 2006643769 is about 44795.5775607370. The cubic root of 2006643769 is about 1261.3146120169.

The spelling of 2006643769 in words is "two billion, six million, six hundred forty-three thousand, seven hundred sixty-nine".