6662406666 has 8 divisors (see below), whose sum is σ = 13324813344. Its totient is φ = 2220802220.

The previous prime is 6662406613. The next prime is 6662406679. The reversal of 6662406666 is 6666042666.

It is a sphenic number, since it is the product of 3 distinct primes.

6662406666 is an admirable number.

It is a super-2 number, since 2×6662406666² = 88775325166322471112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555200550 + ... + 555200561.

It is an arithmetic number, because the mean of its divisors is an integer number (1665601668).

Almost surely, 2^6662406666 is an apocalyptic number.

6662406666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6662406666 is a wasteful number, since it uses less digits than its factorization.

6662406666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110401116.

The product of its (nonzero) digits is 2239488, while the sum is 48.

The square root of 6662406666 is about 81623.5668541874. The cubic root of 6662406666 is about 1881.6710909329.

The spelling of 6662406666 in words is "six billion, six hundred sixty-two million, four hundred six thousand, six hundred sixty-six".