6666660 has 288 divisors, whose sum is σ = 27885312. Its totient is φ = 1244160.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666660 is 666666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 180162 + ... + 180198.

It is an arithmetic number, because the mean of its divisors is an integer number (96824).

Almost surely, 2^6666660 is an apocalyptic number.

6666660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13942656).

6666660 is an abundant number, since it is smaller than the sum of its proper divisors (21218652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666660 is a wasteful number, since it uses less digits than its factorization.

6666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 6666660 is about 2581.9876064768. The cubic root of 6666660 is about 188.2071430404.

It can be divided in two parts, 6 and 666660, that added together give a palindrome (666666).

The spelling of 6666660 in words is "six million, six hundred sixty-six thousand, six hundred sixty".