66868086867 has 32 divisors (see below), whose sum is σ = 96488651520. Its totient is φ = 41047482240.

The previous prime is 66868086851. The next prime is 66868086869. The reversal of 66868086867 is 76868086866.

It is not a de Polignac number, because 66868086867 - 2⁴ = 66868086851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66868086869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2031513 + ... + 2064165.

It is an arithmetic number, because the mean of its divisors is an integer number (3015270360).

Almost surely, 2^66868086867 is an apocalyptic number.

66868086867 is a deficient number, since it is larger than the sum of its proper divisors (29620564653).

66868086867 is a wasteful number, since it uses less digits than its factorization.

66868086867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33683.

The product of its (nonzero) digits is 222953472, while the sum is 69.

Subtracting 66868086867 from its reverse (76868086866), we obtain a palindrome (9999999999).

The spelling of 66868086867 in words is "sixty-six billion, eight hundred sixty-eight million, eighty-six thousand, eight hundred sixty-seven".