6666417771 has 24 divisors (see below), whose sum is σ = 9636434496. Its totient is φ = 4097489760.

The previous prime is 6666417763. The next prime is 6666417781. The reversal of 6666417771 is 1777146666.

It is not a de Polignac number, because 6666417771 - 2³ = 6666417763 is a prime.

It is a super-2 number, since 2×6666417771² = 88882251795009216882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6666417731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 440236 + ... + 455126.

It is an arithmetic number, because the mean of its divisors is an integer number (401518104).

Almost surely, 2^6666417771 is an apocalyptic number.

6666417771 is a deficient number, since it is larger than the sum of its proper divisors (2970016725).

6666417771 is a wasteful number, since it uses less digits than its factorization.

6666417771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803 (or 15790 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 51.

The square root of 6666417771 is about 81648.1339100901. The cubic root of 6666417771 is about 1882.0486354916.

The spelling of 6666417771 in words is "six billion, six hundred sixty-six million, four hundred seventeen thousand, seven hundred seventy-one".