666461744 has 60 divisors (see below), whose sum is σ = 1477342944. Its totient is φ = 289477632.

The previous prime is 666461743. The next prime is 666461767. The reversal of 666461744 is 447164666.

666461744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666461695 and 666461704.

It is not an unprimeable number, because it can be changed into a prime (666461743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54569 + ... + 65655.

Almost surely, 2^666461744 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 666461744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738671472).

666461744 is an abundant number, since it is smaller than the sum of its proper divisors (810881200).

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

666461744 is a wasteful number, since it uses less digits than its factorization.

666461744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11142 (or 11119 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The square root of 666461744 is about 25815.9203593442. The cubic root of 666461744 is about 873.4909473444.

The spelling of 666461744 in words is "six hundred sixty-six million, four hundred sixty-one thousand, seven hundred forty-four".