66869186851 has 2 divisors, whose sum is σ = 66869186852. Its totient is φ = 66869186850.

The previous prime is 66869186807. The next prime is 66869186869. The reversal of 66869186851 is 15868196866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66869186851 - 2²¹ = 66867089699 is a prime.

It is a super-2 number, since 2×66869186851² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66869181851) 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 as a sum of consecutive naturals, namely, 33434593425 + 33434593426.

It is an arithmetic number, because the mean of its divisors is an integer number (33434593426).

Almost surely, 2^66869186851 is an apocalyptic number.

66869186851 is a deficient number, since it is larger than the sum of its proper divisors (1).

66869186851 is an equidigital number, since it uses as much as digits as its factorization.

66869186851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 64.

The spelling of 66869186851 in words is "sixty-six billion, eight hundred sixty-nine million, one hundred eighty-six thousand, eight hundred fifty-one".