6668578865 has 128 divisors (see below), whose sum is σ = 10079354880. Its totient is φ = 4180377600.

The previous prime is 6668578859. The next prime is 6668578877. The reversal of 6668578865 is 5688758666.

It is not a de Polignac number, because 6668578865 - 2²² = 6664384561 is a prime.

It is a super-3 number, since 3×6668578865³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 52508432 + ... + 52508558.

It is an arithmetic number, because the mean of its divisors is an integer number (78744960).

Almost surely, 2^6668578865 is an apocalyptic number.

6668578865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6668578865 is a deficient number, since it is larger than the sum of its proper divisors (3410776015).

6668578865 is a wasteful number, since it uses less digits than its factorization.

6668578865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283.

The product of its digits is 116121600, while the sum is 65.

The square root of 6668578865 is about 81661.3670287242. The cubic root of 6668578865 is about 1882.2519853129.

The spelling of 6668578865 in words is "six billion, six hundred sixty-eight million, five hundred seventy-eight thousand, eight hundred sixty-five".