66495444117638 has 64 divisors (see below), whose sum is σ = 103132031708160. Its totient is φ = 32137413504000.

The previous prime is 66495444117601. The next prime is 66495444117649. The reversal of 66495444117638 is 83671144459466.

66495444117638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 31 ways as a sum of consecutive naturals, for example, 6970898273 + ... + 6970907811.

It is an arithmetic number, because the mean of its divisors is an integer number (1611437995440).

Almost surely, 2^{66495444117638} is an apocalyptic number.

66495444117638 is a deficient number, since it is larger than the sum of its proper divisors (36636587590522).

66495444117638 is a wasteful number, since it uses less digits than its factorization.

66495444117638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11453.

The product of its digits is 418037760, while the sum is 68.

The spelling of 66495444117638 in words is "sixty-six trillion, four hundred ninety-five billion, four hundred forty-four million, one hundred seventeen thousand, six hundred thirty-eight".