6609666979 has 16 divisors (see below), whose sum is σ = 6933024000. Its totient is φ = 6293296800.

The previous prime is 6609666977. The next prime is 6609667019. The reversal of 6609666979 is 9796669066.

It is a cyclic number.

It is not a de Polignac number, because 6609666979 - 2¹ = 6609666977 is a prime.

It is a super-6 number, since 6×6609666979⁶ (a number of 60 digits) contains 666666 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6609666979.

It is not an unprimeable number, because it can be changed into a prime (6609666977) 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, 603252 + ... + 614110.

It is an arithmetic number, because the mean of its divisors is an integer number (433314000).

Almost surely, 2^6609666979 is an apocalyptic number.

6609666979 is a deficient number, since it is larger than the sum of its proper divisors (323357021).

6609666979 is a wasteful number, since it uses less digits than its factorization.

6609666979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11178.

The product of its (nonzero) digits is 39680928, while the sum is 64.

The square root of 6609666979 is about 81299.8584193109. The cubic root of 6609666979 is about 1876.6928217972.

The spelling of 6609666979 in words is "six billion, six hundred nine million, six hundred sixty-six thousand, nine hundred seventy-nine".