866949668 has 24 divisors (see below), whose sum is σ = 1634692920. Its totient is φ = 399928320.

The previous prime is 866949667. The next prime is 866949683.

866949668 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 201412864 + 665536804 = 14192^2 + 25798^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 866949668.

It is not an unprimeable number, because it can be changed into a prime (866949667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162158 + ... + 167418.

It is an arithmetic number, because the mean of its divisors is an integer number (68112205).

Almost surely, 2^866949668 is an apocalyptic number.

It is an amenable number.

866949668 is a deficient number, since it is larger than the sum of its proper divisors (767743252).

866949668 is a wasteful number, since it uses less digits than its factorization.

866949668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8447 (or 8445 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 62.

The square root of 866949668 is about 29444.0090340972. The cubic root of 866949668 is about 953.5232672355.

The spelling of 866949668 in words is "eight hundred sixty-six million, nine hundred forty-nine thousand, six hundred sixty-eight".