2006643767 has 4 divisors (see below), whose sum is σ = 2006817120. Its totient is φ = 2006470416.

The previous prime is 2006643703. The next prime is 2006643787. The reversal of 2006643767 is 7673466002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2006643767 - 2⁶ = 2006643703 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 (2006643787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67967 + ... + 92912.

It is an arithmetic number, because the mean of its divisors is an integer number (501704280).

Almost surely, 2^2006643767 is an apocalyptic number.

2006643767 is a deficient number, since it is larger than the sum of its proper divisors (173353).

2006643767 is a wasteful number, since it uses less digits than its factorization.

2006643767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173352.

The product of its (nonzero) digits is 254016, while the sum is 41.

The square root of 2006643767 is about 44795.5775384133. The cubic root of 2006643767 is about 1261.3146115979.

The spelling of 2006643767 in words is "two billion, six million, six hundred forty-three thousand, seven hundred sixty-seven".