6646684051 has 4 divisors (see below), whose sum is σ = 7596210352. Its totient is φ = 5697157752.

The previous prime is 6646683997. The next prime is 6646684067. The reversal of 6646684051 is 1504866466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1504866466 = 2 ⋅752433233.

It is a cyclic number.

It is not a de Polignac number, because 6646684051 - 2⁹ = 6646683539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6646683992 and 6646684010.

It is not an unprimeable number, because it can be changed into a prime (6646684081) 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, 474763140 + ... + 474763153.

It is an arithmetic number, because the mean of its divisors is an integer number (1899052588).

Almost surely, 2^6646684051 is an apocalyptic number.

6646684051 is a deficient number, since it is larger than the sum of its proper divisors (949526301).

6646684051 is an equidigital number, since it uses as much as digits as its factorization.

6646684051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949526300.

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 6646684051 is about 81527.1982285666. The cubic root of 6646684051 is about 1880.1897396962.

The spelling of 6646684051 in words is "six billion, six hundred forty-six million, six hundred eighty-four thousand, fifty-one".