66120826786 has 32 divisors (see below), whose sum is σ = 113766307200. Its totient is φ = 28233532800.

The previous prime is 66120826777. The next prime is 66120826787. The reversal of 66120826786 is 68762802166.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66120826787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9028006 + ... + 9035326.

It is an arithmetic number, because the mean of its divisors is an integer number (3555197100).

Almost surely, 2^66120826786 is an apocalyptic number.

66120826786 is a deficient number, since it is larger than the sum of its proper divisors (47645480414).

66120826786 is a wasteful number, since it uses less digits than its factorization.

66120826786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 66120826786 in words is "sixty-six billion, one hundred twenty million, eight hundred twenty-six thousand, seven hundred eighty-six".