666248544 has 192 divisors, whose sum is σ = 2184537600. Its totient is φ = 196010496.

The previous prime is 666248543. The next prime is 666248551. The reversal of 666248544 is 445842666.

It is a self number, because there is not a number n which added to its sum of digits gives 666248544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666248543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257047 + ... + 259625.

It is an arithmetic number, because the mean of its divisors is an integer number (11377800).

Almost surely, 2^666248544 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 666248544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092268800).

666248544 is an abundant number, since it is smaller than the sum of its proper divisors (1518289056).

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

666248544 is a wasteful number, since it uses less digits than its factorization.

666248544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2620 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 666248544 is about 25811.7907941313. The cubic root of 666248544 is about 873.3977946450.

The spelling of 666248544 in words is "six hundred sixty-six million, two hundred forty-eight thousand, five hundred forty-four".