66401824 has 24 divisors (see below), whose sum is σ = 132684048. Its totient is φ = 32704320.

The previous prime is 66401767. The next prime is 66401857. The reversal of 66401824 is 42810466.

66401824 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13342 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (5528502).

Almost surely, 2^66401824 is an apocalyptic number.

It is an amenable number.

66401824 is a deficient number, since it is larger than the sum of its proper divisors (66282224).

66401824 is a wasteful number, since it uses less digits than its factorization.

66401824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31048 (or 31040 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 66401824 is about 8148.7314350149. The cubic root of 66401824 is about 404.9424782402.

It can be divided in two parts, 6640 and 1824, that added together give a square (8464 = 92²).

The spelling of 66401824 in words is "sixty-six million, four hundred one thousand, eight hundred twenty-four".