66441726 has 48 divisors (see below), whose sum is σ = 160392960. Its totient is φ = 19736640.

The previous prime is 66441719. The next prime is 66441731. The reversal of 66441726 is 62714466.

66441726 is a `hidden beast` number, since 6 + 644 + 1 + 7 + 2 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1891 + ... + 11681.

It is an arithmetic number, because the mean of its divisors is an integer number (3341520).

Almost surely, 2^66441726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66441726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80196480).

66441726 is an abundant number, since it is smaller than the sum of its proper divisors (93951234).

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

66441726 is a wasteful number, since it uses less digits than its factorization.

66441726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9841 (or 9838 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 66441726 is about 8151.1794238625. The cubic root of 66441726 is about 405.0235743022.

The spelling of 66441726 in words is "sixty-six million, four hundred forty-one thousand, seven hundred twenty-six".