6447426666 has 8 divisors (see below), whose sum is σ = 12894853344. Its totient is φ = 2149142220.

The previous prime is 6447426641. The next prime is 6447426673. The reversal of 6447426666 is 6666247446.

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

6447426666 is an admirable number.

It is a super-2 number, since 2×6447426666² = 83138621226895751112, 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, 537285550 + ... + 537285561.

It is an arithmetic number, because the mean of its divisors is an integer number (1611856668).

Almost surely, 2^6447426666 is an apocalyptic number.

6447426666 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.

6447426666 is a wasteful number, since it uses less digits than its factorization.

6447426666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074571116.

The product of its digits is 6967296, while the sum is 51.

The square root of 6447426666 is about 80295.8695450769. The cubic root of 6447426666 is about 1861.2103990018.

The spelling of 6447426666 in words is "six billion, four hundred forty-seven million, four hundred twenty-six thousand, six hundred sixty-six".