6400066446 has 48 divisors (see below), whose sum is σ = 14475796608. Its totient is φ = 2119203000.

The previous prime is 6400066433. The next prime is 6400066471. The reversal of 6400066446 is 6446600046.

It is a happy number.

6400066446 is a `hidden beast` number, since 6 + 4 + 0 + 0 + 0 + 6 + 644 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6400066446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29781 + ... + 116991.

It is an arithmetic number, because the mean of its divisors is an integer number (301579096).

Almost surely, 2^6400066446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6400066446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7237898304).

6400066446 is an abundant number, since it is smaller than the sum of its proper divisors (8075730162).

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

6400066446 is a wasteful number, since it uses less digits than its factorization.

6400066446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87379 (or 87367 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6400066446 is about 80000.4152864221. The cubic root of 6400066446 is about 1856.6419587356.

The spelling of 6400066446 in words is "six billion, four hundred million, sixty-six thousand, four hundred forty-six".