6666744400 has 60 divisors (see below), whose sum is σ = 16037383264. Its totient is φ = 2663280000.

The previous prime is 6666744341. The next prime is 6666744433. The reversal of 6666744400 is 44476666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314125 + ... + 334675.

Almost surely, 2^6666744400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666744400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8018691632).

6666744400 is an abundant number, since it is smaller than the sum of its proper divisors (9370638864).

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

6666744400 is a wasteful number, since it uses less digits than its factorization.

6666744400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380 (or 21369 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 43.

The square root of 6666744400 is about 81650.1341088917. The cubic root of 6666744400 is about 1882.0793727204.

The spelling of 6666744400 in words is "six billion, six hundred sixty-six million, seven hundred forty-four thousand, four hundred".