6666446644 has 48 divisors (see below), whose sum is σ = 13716017280. Its totient is φ = 2795034240.

The previous prime is 6666446627. The next prime is 6666446653. The reversal of 6666446644 is 4466446666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6666446591 and 6666446600.

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, 951177 + ... + 958159.

It is an arithmetic number, because the mean of its divisors is an integer number (285750360).

It is a self-describing number.

Almost surely, 2^6666446644 is an apocalyptic number.

It is an amenable number.

6666446644 is an abundant number, since it is smaller than the sum of its proper divisors (7049570636).

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

6666446644 is a wasteful number, since it uses less digits than its factorization.

6666446644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8680 (or 8678 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 52.

The square root of 6666446644 is about 81648.3107234926. The cubic root of 6666446644 is about 1882.0513526086.

The spelling of 6666446644 in words is "six billion, six hundred sixty-six million, four hundred forty-six thousand, six hundred forty-four".