6666776665 has 8 divisors (see below), whose sum is σ = 8347963968. Its totient is φ = 5101533360.

The previous prime is 6666776663. The next prime is 6666776671. The reversal of 6666776665 is 5666776666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6666776665 - 2¹ = 6666776663 is a prime.

It is a super-2 number, since 2×6666776665² = 88891822201977044450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666776663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28985871 + ... + 28986100.

It is an arithmetic number, because the mean of its divisors is an integer number (1043495496).

Almost surely, 2^6666776665 is an apocalyptic number.

It is an amenable number.

6666776665 is a deficient number, since it is larger than the sum of its proper divisors (1681187303).

6666776665 is a wasteful number, since it uses less digits than its factorization.

6666776665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57971999.

The product of its digits is 68584320, while the sum is 61.

The square root of 6666776665 is about 81650.3316894671. The cubic root of 6666776665 is about 1882.0824089446.

Subtracting from 6666776665 its reverse (5666776666), we obtain a palindrome (999999999).

The spelling of 6666776665 in words is "six billion, six hundred sixty-six million, seven hundred seventy-six thousand, six hundred sixty-five".