66881086066869 has 4 divisors (see below), whose sum is σ = 89174781422496. Its totient is φ = 44587390711244.

The previous prime is 66881086066853. The next prime is 66881086066889. The reversal of 66881086066869 is 96866068018866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66881086066869 - 2⁴ = 66881086066853 is a prime.

It is a super-2 number, since 2×66881086066869² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66881086066794 and 66881086066803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66881086066889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11146847677809 + ... + 11146847677814.

It is an arithmetic number, because the mean of its divisors is an integer number (22293695355624).

Almost surely, 2^{66881086066869} is an apocalyptic number.

It is an amenable number.

66881086066869 is a deficient number, since it is larger than the sum of its proper divisors (22293695355627).

66881086066869 is a wasteful number, since it uses less digits than its factorization.

66881086066869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22293695355626.

The product of its (nonzero) digits is 1719926784, while the sum is 78.

The spelling of 66881086066869 in words is "sixty-six trillion, eight hundred eighty-one billion, eighty-six million, sixty-six thousand, eight hundred sixty-nine".