2006646761 has 16 divisors (see below), whose sum is σ = 2323515264. Its totient is φ = 1697376384.

The previous prime is 2006646749. The next prime is 2006646767. The reversal of 2006646761 is 1676466002.

It is a cyclic number.

It is not a de Polignac number, because 2006646761 - 2¹⁸ = 2006384617 is a prime.

It is a super-2 number, since 2×2006646761² = 8053262446863582242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2006646767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843005 + ... + 845381.

It is an arithmetic number, because the mean of its divisors is an integer number (145219704).

Almost surely, 2^2006646761 is an apocalyptic number.

It is an amenable number.

2006646761 is a deficient number, since it is larger than the sum of its proper divisors (316868503).

2006646761 is a wasteful number, since it uses less digits than its factorization.

2006646761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 2006646761 is about 44795.6109568784. The cubic root of 2006646761 is about 1261.3152389097.

The spelling of 2006646761 in words is "two billion, six million, six hundred forty-six thousand, seven hundred sixty-one".