866027720669 has 32 divisors (see below), whose sum is σ = 949706035200. Its totient is φ = 787053983040.

The previous prime is 866027720651. The next prime is 866027720711. The reversal of 866027720669 is 966027720668.

It is a cyclic number.

It is not a de Polignac number, because 866027720669 - 2¹² = 866027716573 is a prime.

It is a super-2 number, since 2×866027720669² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866027720629) 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, 8141114 + ... + 8246804.

It is an arithmetic number, because the mean of its divisors is an integer number (29678313600).

Almost surely, 2^866027720669 is an apocalyptic number.

It is an amenable number.

866027720669 is a deficient number, since it is larger than the sum of its proper divisors (83678314531).

866027720669 is a wasteful number, since it uses less digits than its factorization.

866027720669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105945.

The product of its (nonzero) digits is 18289152, while the sum is 59.

Subtracting 866027720669 from its reverse (966027720668), we obtain a palindrome (99999999999).

The spelling of 866027720669 in words is "eight hundred sixty-six billion, twenty-seven million, seven hundred twenty thousand, six hundred sixty-nine".