6646579261 has 16 divisors (see below), whose sum is σ = 7940542464. Its totient is φ = 5439615984.

The previous prime is 6646579253. The next prime is 6646579271. The reversal of 6646579261 is 1629756466.

It is a happy number.

6646579261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6646579261 - 2³ = 6646579253 is a prime.

It is a super-2 number, since 2×6646579261² = 88354031745510612242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6646579199 and 6646579208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646579201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53980 + ... + 127306.

It is an arithmetic number, because the mean of its divisors is an integer number (496283904).

Almost surely, 2^6646579261 is an apocalyptic number.

It is an amenable number.

6646579261 is a deficient number, since it is larger than the sum of its proper divisors (1293963203).

6646579261 is a wasteful number, since it uses less digits than its factorization.

6646579261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73920.

The product of its digits is 3265920, while the sum is 52.

The square root of 6646579261 is about 81526.5555570699. Note that the first 5 decimals coincide. The cubic root of 6646579261 is about 1880.1798587733.

The spelling of 6646579261 in words is "six billion, six hundred forty-six million, five hundred seventy-nine thousand, two hundred sixty-one".