66316603201600 has 84 divisors (see below), whose sum is σ = 165415638506644. Its totient is φ = 26163262586880.

The previous prime is 66316603201571. The next prime is 66316603201649. The reversal of 66316603201600 is 610230661366.

It can be written as a sum of positive squares in 6 ways, for example, as 577977021504 + 65738626180096 = 760248^2 + 8107936^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283772769 + ... + 284006368.

Almost surely, 2^{66316603201600} is an apocalyptic number.

It is an amenable number.

66316603201600 is an abundant number, since it is smaller than the sum of its proper divisors (99099035305044).

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

66316603201600 is a wasteful number, since it uses less digits than its factorization.

66316603201600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567779232 (or 567779217 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

Adding to 66316603201600 its reverse (610230661366), we get a palindrome (66926833862966).

The spelling of 66316603201600 in words is "sixty-six trillion, three hundred sixteen billion, six hundred three million, two hundred one thousand, six hundred".