866575575669 has 16 divisors (see below), whose sum is σ = 1171191994560. Its totient is φ = 569868942720.

The previous prime is 866575575631. The next prime is 866575575683. The reversal of 866575575669 is 966575575668.

It is a happy number.

It is not a de Polignac number, because 866575575669 - 2¹⁶ = 866575510133 is a prime.

It is a super-2 number, since 2×866575575669² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866575575669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866575575269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3742227 + ... + 3967040.

It is an arithmetic number, because the mean of its divisors is an integer number (73199499660).

Almost surely, 2^866575575669 is an apocalyptic number.

866575575669 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

866575575669 is a deficient number, since it is larger than the sum of its proper divisors (304616418891).

866575575669 is a wasteful number, since it uses less digits than its factorization.

866575575669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7709780.

The product of its digits is 2857680000, while the sum is 75.

Subtracting 866575575669 from its reverse (966575575668), we obtain a palindrome (99999999999).

The spelling of 866575575669 in words is "eight hundred sixty-six billion, five hundred seventy-five million, five hundred seventy-five thousand, six hundred sixty-nine".