66869186857 has 32 divisors (see below), whose sum is σ = 75759763968. Its totient is φ = 58492800000.

The previous prime is 66869186851. The next prime is 66869186869. The reversal of 66869186857 is 75868196866.

It is a cyclic number.

It is not a de Polignac number, because 66869186857 - 2¹⁹ = 66868662569 is a prime.

It is a Duffinian number.

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 31 ways as a sum of consecutive naturals, for example, 12341613 + ... + 12347029.

It is an arithmetic number, because the mean of its divisors is an integer number (2367492624).

Almost surely, 2^66869186857 is an apocalyptic number.

It is an amenable number.

66869186857 is a deficient number, since it is larger than the sum of its proper divisors (8890577111).

66869186857 is a wasteful number, since it uses less digits than its factorization.

66869186857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841.

The product of its digits is 209018880, while the sum is 70.

The spelling of 66869186857 in words is "sixty-six billion, eight hundred sixty-nine million, one hundred eighty-six thousand, eight hundred fifty-seven".