666726750144 has 336 divisors, whose sum is σ = 2354088784320. Its totient is φ = 175688663040.

The previous prime is 666726750101. The next prime is 666726750167. The reversal of 666726750144 is 441057627666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69236722 + ... + 69246350.

It is an arithmetic number, because the mean of its divisors is an integer number (7006216620).

Almost surely, 2^666726750144 is an apocalyptic number.

666726750144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666726750144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177044392160).

666726750144 is an abundant number, since it is smaller than the sum of its proper divisors (1687362034176).

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

666726750144 is a wasteful number, since it uses less digits than its factorization.

666726750144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10988 (or 10975 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 666726750144 in words is "six hundred sixty-six billion, seven hundred twenty-six million, seven hundred fifty thousand, one hundred forty-four".