6666777747 has 24 divisors (see below), whose sum is σ = 11192014080. Its totient is φ = 3745015920.

The previous prime is 6666777739. The next prime is 6666777763. The reversal of 6666777747 is 7477776666.

It is not a de Polignac number, because 6666777747 - 2³ = 6666777739 is a prime.

It is a super-3 number, since 3×6666777747³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (6666777737) 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, 893079 + ... + 900512.

It is an arithmetic number, because the mean of its divisors is an integer number (466333920).

Almost surely, 2^6666777747 is an apocalyptic number.

6666777747 is a deficient number, since it is larger than the sum of its proper divisors (4525236333).

6666777747 is a wasteful number, since it uses less digits than its factorization.

6666777747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793663 (or 1793660 counting only the distinct ones).

The product of its digits is 87127488, while the sum is 63.

The square root of 6666777747 is about 81650.3383152820. The cubic root of 6666777747 is about 1882.0825107636.

The spelling of 6666777747 in words is "six billion, six hundred sixty-six million, seven hundred seventy-seven thousand, seven hundred forty-seven".