6666906840 has 64 divisors (see below), whose sum is σ = 21818972160. Its totient is φ = 1616219520.

The previous prime is 6666906821. The next prime is 6666906859. The reversal of 6666906840 is 486096666.

It is an interprime number because it is at equal distance from previous prime (6666906821) and next prime (6666906859).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2524024 + ... + 2526663.

It is an arithmetic number, because the mean of its divisors is an integer number (340921440).

Almost surely, 2^6666906840 is an apocalyptic number.

6666906840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6666906840 is an abundant number, since it is smaller than the sum of its proper divisors (15152065320).

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

6666906840 is a wasteful number, since it uses less digits than its factorization.

6666906840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050712 (or 5050708 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 6666906840 is about 81651.1288348177. The cubic root of 6666906840 is about 1882.0946586666.

The spelling of 6666906840 in words is "six billion, six hundred sixty-six million, nine hundred six thousand, eight hundred forty".