66869186858 has 16 divisors (see below), whose sum is σ = 101973785760. Its totient is φ = 32878201200.

The previous prime is 66869186851. The next prime is 66869186869. The reversal of 66869186858 is 85868196866.

It is a junction number, because it is equal to n+sod(n) for n = 66869186791 and 66869186800.

It is not an unprimeable number, because it can be changed into a prime (66869186851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432113 + ... + 566091.

It is an arithmetic number, because the mean of its divisors is an integer number (6373361610).

Almost surely, 2^66869186858 is an apocalyptic number.

66869186858 is a deficient number, since it is larger than the sum of its proper divisors (35104598902).

66869186858 is a wasteful number, since it uses less digits than its factorization.

66869186858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138133.

The product of its digits is 238878720, while the sum is 71.

The spelling of 66869186858 in words is "sixty-six billion, eight hundred sixty-nine million, one hundred eighty-six thousand, eight hundred fifty-eight".