66406020602644 has 24 divisors (see below), whose sum is σ = 117170305132608. Its totient is φ = 32929688176320.

The previous prime is 66406020602591. The next prime is 66406020602657. The reversal of 66406020602644 is 44620602060466.

It is a happy number.

66406020602644 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 = 66406020602594 and 66406020602603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111905217 + ... + 112497064.

It is an arithmetic number, because the mean of its divisors is an integer number (4882096047192).

Almost surely, 2^{66406020602644} is an apocalyptic number.

It is an amenable number.

66406020602644 is a deficient number, since it is larger than the sum of its proper divisors (50764284529964).

66406020602644 is a wasteful number, since it uses less digits than its factorization.

66406020602644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224402895 (or 224402893 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 46.

The spelling of 66406020602644 in words is "sixty-six trillion, four hundred six billion, twenty million, six hundred two thousand, six hundred forty-four".