666001344 has 56 divisors (see below), whose sum is σ = 1772765568. Its totient is φ = 220660480.

The previous prime is 666001313. The next prime is 666001361. The reversal of 666001344 is 443100666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21679 + ... + 42449.

It is an arithmetic number, because the mean of its divisors is an integer number (31656528).

Almost surely, 2^666001344 is an apocalyptic number.

666001344 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 666001344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886382784).

666001344 is an abundant number, since it is smaller than the sum of its proper divisors (1106764224).

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

666001344 is a wasteful number, since it uses less digits than its factorization.

666001344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20953 (or 20943 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 666001344 is about 25807.0018405858. The cubic root of 666001344 is about 873.2897615670.

The spelling of 666001344 in words is "six hundred sixty-six million, one thousand, three hundred forty-four".